multifocal lens

专利摘要:
multifocal lens. the present invention relates to a multifocal lens (13,18,24) with a number n> 2 of main powers, in which at least one main power is refractive and at least one main power is diffraction, including a first lens part (15,16,23,25,26) that has at least one first annular zone (6,10,10,27,28) and at least a second lens part (15,16,23,25, 26) which has at least one second annular zone (6,10,10,27,28), in which each of the zones (6,10,10,27,28) has at least one main sub-area (7,11, 20,29,31) and at least one phase sub-area (8,12,21,30,32), in which to form the n main powers, a maximum of n - 1 parts of lens (15,16,23, 25.26) is combined, and the average refractive power of a zone (6,10,10,27,28) of the first lens part (15,16,23,25,26) is equal to a refractive power medium of a zone (6,10,10,27,28) of the second lens part (15,16,23,25,26).
公开号:BR112012027433B1
申请号:R112012027433
申请日:2011-04-26
公开日:2020-04-22
发明作者:Gerlach Mario；Fiala Werner
申请人:Carl Zeis Meditec Ag；
IPC主号:

专利说明:

(54) Title: MULTIFOCAL LENS (51) Int.CI .: G02C 7/04; G02C 7/06.
(30) Unionist Priority: 27/04/2010 DE 1020100184365.
(73) Holder (s): CARL ZEIS MEDITEC AG.
(72) Inventor (s): WERNER FIALA; MARIO GERLACH.
(86) PCT Application: PCT EP2011056552 of 26/04/2011 (87) PCT Publication: WO 2011/134948 of 11/03/2011 (85) Date of the Beginning of the National Phase: 25/10/2012 (57) Summary: MULTIFOCAL LENS. The present invention relates to a multifocal lens (13,18,24) with a number n> 2 of main powers, in which at least one main power is refractive and at least one main power is diffraction, including a first lens part (15,16,23,25,26) that has at least one first annular zone (6,10,10,27,28) and at least a second lens part (15,16,23,25, 26) that has at least one second annular zone (6,10,10,27,28), in which each of the zones (6,10,10,27,28) has at least one main sub-area (7,11, 20,29,31) and at least one phase sub-area (8,12,21,30,32), in which to form the n main powers, a maximum of n -1 lens parts (15,16,23, 25.26) is combined, and an average refractive power of a zone (6,10,10,27,28) of the first lens part (15,16,23,25,26) is equal to a refractive power medium of a zone (6,10,10,27,28) of the second lens part (15,16,23,25,26).
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Descriptive Report of the Invention Patent for MULTIFOCAL LENS.
description
Technical Field [0001] The invention relates to a multifocal lens with a number n> 2 of main powers, in which at least one main power is refractive and at least one other main power is diffraction. The multifocal lens includes a first lens part that has at least a first annular zone and includes at least a second lens part that has at least a second annular zone. Each of the zones is formed with at least one main subzone and at least one phase subzone.
Prior Art [0002] Multifocal lenses with refractive and diffractive powers are known from EP 1 194 797 B1. These lenses have annular or circular-annular zones, where each of these annular zones is divided into each of a main and a phase subzone. The main subzone system represents a diffraction lens that has two main powers. The refractive powers in the phase subzones are selected in such a way that the average refractive power calculated for the entire zone or the entire lens corresponds to one of the two main diffractive powers. Unlike conventional diffraction lenses, the lens according to EP 1 194 797 B1 has no topographic or optical step on the lens surface.
[0003] In EP 1 194 797 B1, trifocal lenses are also described, in which the average of the calculated refractive power is equal to the average of the three main powers, where the largest main power is provided by the first diffraction power order, and in which the lowest main power is provided by the first order diffraction power.
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2/45 [0004] Trifocal lenses of the type described have longitudinal chromatic aberrations in both the smallest and the largest of the three main powers. If such lenses are to be used as ophthalmic lenses (for example, contact lenses, intraocular lenses), then, in particular, longitudinal chromatic aberration in the smallest of the main powers is disadvantageous. That is, this power is then used for the formation of distant objects, and a longitudinal chromatic aberration associated with the first diffraction order is particularly disturbing in such use.
[0005] Multifocal lenses with more than two main powers are specifically desired in the field of ophthalmology, since they allow for acute vision at a great distance, at an intermediate distance and at reading distance. In addition to the trifocal lenses according to EP 1 194 797 B1, other trifocal lenses are known. U.S. Patent 5,344,447 describes trifocal diffraction lenses, as well as U.S. Patent 5,760,871. Another trifocal lens is described in U.S. patent 2008/0030677 A1.
[0006] The trifocal lens according to U.S. patent 5,344,447 has a minimum main diffraction power equal to the first diffraction power with longitudinal chromatic aberration. In addition, this lens has topographic or optical steps on at least one of the lens surfaces, which is usual for diffraction lenses.
[0007] The trifocal lens according to U.S. patent 5,760,871 also has a minimum main diffractive power, which corresponds to the first order of longitudinal chromatic aberration.
[0008] The trifocal lens according to U.S. patent 2008/0030677
A1 has a minimum main diffraction power, which corresponds to 0 ^the diffraction order, and a maximum power, which corresponds to the first diffraction order of the diffraction lens. According to this prior technique, light is directed to a place between the two focuses of these powers
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3/45 by a certain design of adjacent diffraction steps. Like all conventional diffraction lenses, this lens has either topographic or optical steps on one of the two lens surfaces.
[0009] Topographic steps on a lens surface are disadvantageous for several reasons: In general, such steps are difficult to produce or are not produced with the required precision. In addition, such steps are detrimental to the comfort of use in ophthalmic lenses such as contact lenses.
[00010] A diffractive lens or a diffractive lens generally consists of a number of circular-annular areas of the lens in each identical area; such zones are generally called Fresnel zones. Between adjacent zones, steps are generally provided with differences in path length t associated therewith, where these differences in path length are generally less than a wavelength λ of the drawing. The area or size of the zones determines the separations between the diffractive powers of the lens, where these separations increase with the decrease in the area of the zones. The difference in the optical path length t determines the relative maximum intensities in the individual diffractive powers, for example, at = t = λ / 2, there are two main diffractive powers, which correspond to 0 ^a and the first diffraction order, and both have a maximum intensity of (2 / π) ² = 40.5%, where 100% is the maximum intensity of a lens limited in diffraction with identical Fresnel zones, but no step between the zones. The last lens is a normal refractive lens. For path length differences, which are absolutely smaller than the half wavelength of the drawing, the power of the 0th order dominates, in the case of abs (t)> λ / 2, the power of the first diffraction order has the relative intensity bigger.
[00011] It is extremely important to note that a power of
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4/45 refraction is associated with each individual Fresnel zone of a diffraction lens; this refractive power can be calculated by refracting an incident light beam with the application of Snell's law of refraction. The individual Fresnel zone can have a uniform power, but it can also have a surface configuration for the effect that the refractive power varies across the surface of the zone; then, the refractive power of such a zone is an average power.
[00012] In conventional multifocal diffraction lenses with optical steps between contiguous zones, none of the diffraction powers are identical to the refractive powers of the zones. In particular, this also applies to the 0 ° diffraction power of a diffraction lens.
[00013] There are two fundamental diffraction lens formations. In the first formation, the difference in path length t between the first and the second zones is equal to that between the second and the third zones, and so on. The modalities of such diffraction lenses generally have a sawtooth profile on one of the two surfaces of a manufactured lens with a given index of refraction. In the second fundamental formation of diffraction lenses according to the prior art, the differences in optical path length are + t between the first and second zones, -t between the second and third zones, + t between the third and the fourth zones, and so on. The disadvantages of such known diffraction lenses are explained in EP 1 194 797 B1.
[00014] In EP 1 194 797 B1, the lenses are mentioned according to the invention in that case, which are formed without topographic and optical steps on the lens surface. In this context, a trifocal lens is also mentioned, in which the individual zones have different mean powers, and, in addition, longitudinal disadvantageous chromatic aberrations occur in both the smallest and the largest of the three main powers.
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Presentation of the Invention [00015] The purpose of the present invention is to provide a lens at least trifocal, which allows for improved vision in the near range and in the middle range, and in particular in the far range.
[00016] This objective is achieved by a multifocal lens that has the characteristics according to claim 1.
[00017] A multifocal lens according to the invention has at least a number n> 2 of main powers. Therefore, the multifocal lens is at least a trifocal lens. Especially, at least one of the main powers is refractive and at least one additional main power is diffractive. The multifocal lens has a first lens part that includes at least one first annular zone. The multifocal lens also includes at least a second lens part that has at least a second annular zone. Each of the lens part zones has at least one main subzone and at least one phase subzone. The main subzone and phase subzone are also annularly formed. For the formation of the n main powers in the multifocal lens according to the invention, a maximum of n-1 lens parts is combined. An average calculated refractive power of one zone of a lens part is equal to an average refractive power of a zone of another lens part. This is equivalent to saying that all the lens parts that make up a multifocal lens have the same average refractive power. If a lens is constructed, for example, of two lens parts, then these two lens parts have the same average refractive power. If the lens is constructed, for example, of three lens parts, then the three lens parts have the same average refractive power. By such a specific configuration of the multifocal lens, image formation and thus also vision with the lens in the near range, in the middle range and in particular in the far range can be improved.
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6/45 [00018] The lens parts are different in at least one optical parameter. For example, a power such as a far-sight power or a near-sight power or an addition power should be mentioned as optical parameters. In addition, an optical parameter can also, for example, be an intensity from a distance or the size of an optical surface.
[00019] In this context, for a lens part, a circular or circular-annular (annular) area of the lens must in particular be understood. A lens portion can also be made up of several non-contiguous areas or circular or circular-annular areas of the lens.
[00020] By a main power, a power comprises in particular the relative intensity that is greater than 0.05 (5%), and in particular greater than or equal to 0.07 (7%).
[00021] In a particularly advantageous manner, a configuration is obtained, in which the multifocal lens has no longitudinal chromatic aberration of diffraction in the smallest of the n main powers. This ensures a greatly improved image-forming feature and thus considerably better vision particularly in the far range.
[00022] A chromatic aberration of refraction due to the dispersion of the optical material, which is small with respect to the chromatic aberration and opposite in the first order of diffraction - is not a problem in the present invention.
[00023] Especially, this is particularly advantageous with respect to color representation and image perception.
[00024] Preferably, it is provided that the average refractive power of a zone is equal to or less than the main powers of the multifocal lens. By this specification of the lens, the suppression of the longitudinal chromatic aberration of diffraction in the minor of the main powers is effected. Preferably, this is also formed for all
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7/45 the zones of a lens part, if it has at least two zones. In particular, the zones of a lens part have the same average refractive power.
[00025] In particular, the smallest of the n main powers is free from longitudinal chromatic aberration of diffraction.
[00026] Preferably, the multifocal lens is formed in the shape and / or in the relative position of the zones with each other in such a way that the smallest of the main powers is free from the longitudinal chromatic aberration regardless of the number of main powers n> 2. Thus , the lens is also formed with its lens parts and the zones respectively associated for the effect that not only in a trifocal lens, but also in a quadrafocal lens, etc., the smallest of the main powers is always free from the longitudinal chromatic aberration of diffraction.
[00027] Preferably, the smallest of the n main powers of the multifocal lens is dependent on the refractive power of a main subzone of a first zone weighted by the ratio between the area of the main subzone and the total surface of that first zone and, in addition, also dependent on the refractive power of the phase subzone of that first zone weighted by the proportion between the area of the phase subzone and the total surface of that zone considered. This applies in particular to each of the zones of the multifocal lens, in which in particular for the smallest of the main powers Di of the lens, the relationship thus applies:
Di = Dgi (1 - pi) + Dsipi = Dg2 (1 - p2) + DS2p2 [00028] Hence, it applies:
[00029] Dgi is the refractive power in the main sub-area of the first zone (and 3 ^a , 5 ^a , ...) zone; Dsi is the refractive power of the phase subzone of the first (and 3a, 5a, ...) zone. pi is the ratio between the area of the phase sub-area and the first (and 3a, 5a, ...) total zone.
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8/45 [00030] Dg2 is the refractive power in the second main sub (and 4 ^th, 6 ^th, ...) area; Ds2 is the refractive power in the phase subzone of the second (and 4th, 6th, ...) zone. p2 is the ratio between the area of the phase sub-area and the second (and 4a, 6a, ...) total zone.
[00031] The above indication is shown for a lens with two lens parts, where zones with odd numbers are associated with the first lens part and zones with even numbers are associated with the second lens part. The above-mentioned equation also applies to a multifocal lens with more than two lens parts; for another part j of the lens, therefore, it applies: D1 = DGj ⁽¹ - pj) ⁺ DSj pj [00032] Preferably, it is provided so that the first lens part has at least two zones, among which seen in the radial direction of the lens, at least one area of the second lens part is arranged. Therefore, the configuration in this implementation is such that in the alternative ring arrangement a first zone of the first lens part is formed, then it follows a zone of the second lens part and is seen in the radial direction, and then again another first zone of the first lens part is formed. If more than two lens parts are formed, this alternative arrangement thus applies to the effect that, seen in the radial direction, a zone of one of the lens parts is arranged, consecutively a zone of one of the lens parts is respectively arranged, and then, if an annular zone is formed from each lens part, again follows a first zone of the first lens part, and so on.
[00033] It can also be provided that, in the case of more than two lens parts, each lens part has only one zone, and the multifocal lens is formed in this way. It can also be provided so that at least one lens part has more than one zone.
[00034] Preferably, it is provided for a first zone of the
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9/45 the first lens part is formed contiguous to a zone of the second lens part and the optical surfaces of these two zones are of equal size. This is particularly true for all respectively adjacent zones in pairs of two different parts of the lens.
[00035] With respect to the optical surfaces of the zones, both the front and rear faces of the lens can be considered in this regard. Depending on how the multifocal lens is configured in this regard, the front face may have a corresponding surface profile and the rear face may have a corresponding surface profile as well. If the front face is configured accordingly, the rear face can thus be formed aspherically. This is inversely true if the back face has a corresponding surface profile.
[00036] It can also be provided that the respective coupling surface with the surface with the structured surface profile (profile with the annular zones) is formed toric or aspheric-toric. In this way, a monothoric intraocular lens to correct corneal astigmatism can be formed.
[00037] Preferably, it is provided that a total zone formed of adjacent zones of two lens parts has a total main subzone or a main subzone with the average refractive power Dgi2 and a phase subzone with the power Ds2. The Ds2 power is already indicated above, the Dgi2 power is provided by:
dz = D _ot ' ^P ₊ ρ Ρι_ + D _o 2
- Pz ² - Pz ² - Pz [00038] In particular, these ratios apply to a trifocal lens with two lens parts.
[00039] Preferably, a total zone formed from the two adjacent zones of the two lens parts has a refractive power of
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10/45 total phase subzone or phase subzone, which corresponds to the power of the phase subzone of a lens part. In particular, this is that part of the lens that is radially outward, and so the phase subarea radially outward has the Ds2 power.
[00040] Preferably, it is provided that, in a multifocal lens implementation, a relative distance intensity of at least one zone of the first lens part is greater than 10%, in particular at least 30%, and preferably at least 100% different from a relative distance intensity of at least one zone of the second lens part. By such a specific difference in intensities from afar, the image forming characteristic of the multifocal lens can be improved in a particularly positive way, in particular with respect to the inhibition of a longitudinal chromatic aberration in the minor of the main powers of the lens.
[00041] Preferably, it is provided that, in an implementation of the multifocal lens with more than two lens parts, far relative intensities of each different pair are formed between zones of different parts of the lens. In this way, it is particularly provided that the relative intensities of the respectively lower powers of the lens parts have such a difference percentage of more than 10%. Thus, even in specific multifocal lenses with more than three main powers, such a specification of intensities from afar also exists.
[00042] In a particularly advantageous manner, the lens is a trifocal lens, which is constructed of two parts of a bifocal lens. Such a specific lens advantageously allows in particular the improvement of vision and especially has no longitudinal chromatic aberration in the least of the main powers.
[00043] Preferably, the lens parts are formed in shape and / or in the local arrangement in relation to each other in such a way that a
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11/45 power away from the multifocal lens is substantially equal to the power away from a lens, which is formed exclusively from zones of the first lens part or exclusively from zones of the second lens part. [00044] In particular, the lens parts are preferably formed in shape and / or in local arrangement relative to each other in such a way that a power near the multifocal lens is substantially equal to that power near a lens, which is formed exclusively from zones of the first lens part or exclusively from zones of the second lens part.
[00045] Preferably, a proportion between the percentage of the area of at least one phase sub-area and the proportion of the total area of the optical surface of a zone is less than 25%, and preferably between 8% and 17%.
[00046] In particular, it can be provided that an addition power of a bifocal part of the lens is equal to the add power of a second lens part. However, the addition powers of various lens parts can also be different.
[00047] In an advantageous implementation, it may be provided that each of the minor powers of the lens parts and the addition powers of the lens parts are the same, and in particular the intensities from far and / or the intensities from near the powers of the lens parts are different.
[00048] In an additional implementation, it can also be provided that each of the major powers of the lens parts and the addition powers of the lens parts are different and in particular the intensities from far and / or the intensities from near the powers lens parts are different. In particular, the minor powers of the lens parts are then the same.
[00049] In a multifocal lens configuration as a trifocal lens formed from two parts of a bifocal lens, it can be provided for
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12/45 that the minor power of the first bifocal part of the lens is different from the minor power of the second bifocal part of the lens.
[00050] In particular, it can also be provided that the greater power of the first bifocal part of the lens is different from the greater power of the second bifocal part of the lens.
[00051] Preferably, a lens part is provided with at least two zones, which have an identical number of main sub-zones and an identical number of phase sub-zones. In particular, each zone has only one main subzone and only one phase subzone, where the phase subzone is preferably arranged radially outwardly than the main subzone and ends with the edge of the zone radially outermost. In particular, it is also provided that each of the two lens parts has a plurality of zones, which are formed identically with respect to the number of main and phase subzones and / or with respect to the local arrangement of the phase in a zone.
[00052] It can also be provided that the zones of one lens part and / or the zones of another lens part are formed distinctly with respect to their number of main sub-zones and / or with respect to their number of phase sub-zones . Similarly, the local positions of the phase subzones in a zone can also be different.
[00053] In a preferred embodiment, a zone of a lens part is formed adjacent to a zone of another lens part and the optical surfaces of the zones are the same size. In particular, the optical surfaces of all areas of a lens part are the same size. The correspondent also applies particularly to the optical surfaces of all areas of another lens part.
[00054] Preferably, a relative distance intensity of at least one area of the first lens part is greater than 10%, in
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13/45 in particular at least 30%, and in particular at least 100% different from a relative distance intensity of at least one area of the second lens part.
[00055] Preferably, the lens parts have identical addition powers.
[00056] Preferably, a lens with n> 2 main powers is constructed of n parts - 1 part of a bifocal lens. Thus, it can be a trifocal lens constructed of two parts of a bifocal lens. A quadrifocal lens can also be provided, which is formed of three parts of a bifocal lens. In particular for that lens, implementations with identical addition powers and / or far different intensities of more than 10% and / or equally sized optical surfaces of the regions of the lens parts are advantageous.
[00057] Preferably, in a lens with n> 2 main powers, which is constructed of n - 1 parts of a bifocal lens, such a configuration is provided with a continuous focus range and thus the power range is also formed with the superimposed formation of the depth of focus ranges of the respective foci. This has the advantage that the failure of the image for certain powers varies between the powers and thus no reverse foci occur.
[00058] In an implementation other than this, it is provided that a lens with n> 2 main powers, in particular four main powers, is constructed of less than n - 1 parts, in particular two parts of a bifocal lens.
[00059] Preferably, here, it is provided that the size of an optical surface of a zone of the first lens part is different from the size of an optical surface of a zone of the second lens part.
[00060] In particular, the optical surface of the second lens part is greater than the optical surface of the first lens part by at least
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50%, and in particular at least 90%. In this way, quadrifocal lenses can also be formed from two parts of a bifocal lens.
[00061] In these implementations, it is in particular provided that the addition powers of the two lens parts are different.
[00062] In these implementations, it is in particular provided that the two lens parts have identical relative distance intensities, preferably 50%.
[00063] In particular, the optical surfaces of the lens are free of topographic and optical steps. This means that the surface contour is continuous. In particular, this also means that the wavefront behind the lens according to the invention is continuous, that is, there will be no optical differences in path length or optical steps between partial parts of the wavefront behind the lens.
[00064] In a preferred implementation of the lens, a lens surface structured with the zones is formed in such a way that it has an astigmatic effect with respect to its image forming characteristic. In particular, the powers of the zones are formed distinctly depending on a meridian angle and thereby the position of a meridian, in particular the main axis. In a toric lens, the two meridians are the main axes, the axes of the ellipse. The difference between the two powers in the two meridians is known as the cylinder. The lens surface structured with the zones is applied in particular to a toric or toric-aspherical base body. From there, a variant of a bitoric configuration also results, in which both sides (structured and structured) can be formed toric or aspheric-toric. The advantage of bitoric is that the optical optical effect on the two surfaces, the front surface and the rear surface of the lens, can be divided. This results in minor radius differences in the main meridians respectively for both surfaces
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15/45 compared to a monothorous intraocular lens with the same cylinder effect. The quality of the image formation of boreic intraocular lenses is better compared to monothoric intraocular lenses. In this way, a bitoric intraocular lens can be constructed to correct corneal astigmatisms.
[00065] Preferably, on at least one meridian, in particular each meridian, an average refractive power of a zone of the first lens part is each equal to an average refractive power of a zone of the second lens part. This is also possible in particular on different meridians.
[00066] In an advantageous implementation, it is provided that the entire lens with n> 2 main powers is composed of a maximum of n - 1 lens parts with each of at least one zone and therefore other lens parts are not more gifts. Thus, in this context, it can be provided for a trifocal lens to be composed of two parts of a bifocal lens. Similarly, it can be provided for a quadrifocal lens to be composed of three lens parts, in particular three parts of a bifocal lens, and other additional lens parts are no longer provided. Similarly, it can be provided that a quadrifocal lens is composed of merely two different parts of the lens, in particular two different parts of the bifocal lens, and other additional parts of the lens are no longer present. The specific implementations and substances mentioned above also apply to such total lenses, which are composed of n - 1 parts of lens, in particular n - 1 parts of bifocal lens.
[00067] In other implementations, however, it can also be provided for * that a total lens with n> 2 main powers is projected from a maximum of n - 1 lens parts with each of at least one zone, which, for each of which is made up of at least one main sub-area and at least one phase sub-area,
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16/45 and, in addition, it has at least an additional part of the lens.
[00068] In this context, a lens can be formed, which is designed in particular as a quadrifocal lens. According to a first implementation, it can be provided that this quad-focal lens is composed only of two lens parts, which differ by at least one value from an optical parameter. Each of the two lens parts has at least one zone, which, in turn, has at least one main subzone and one phase subzone, respectively. An average refractive power of a zone of the first lens part is equal to an average refractive power of a zone of the second lens part. Preferably, it is provided that the power of adding the first lens part is 3.75 diopters, and the power of adding the second lens part is 3.1 diopters. Preferably, the diameter of this lens is 4,245 mm. In particular, it is provided that the relative distance intensity in the zones of the first lens part is 90%, and preferably that the relative distance intensity in the zones of the second lens part is 40%. Preferably, the proportion of the main sub-area in a zone is 90%. Preferably, this proportion of the percentage of the main sub-area area is the same in all zones.
[00069] The optical areas of the zones of the first lens part and thus of the numbered zones in the sequence of odd numbers are different in the size of the optical areas of the zones of the second lens part and thus of the numbered zones with even numbers.
[00070] In an additional preferred mode, all annular zones numbered with odd numbers have the same surface area. In addition, all annular zones numbered with even numbers have the same surface area, which is different from the surface area of annular zones numbered with odd numbers. Therefore, the radial thicknesses of the zones are different and decrease
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17/45 with the lens radius.
[00071] In an additional implementation, it can be provided that this quadrifocal lens is not composed of two lens parts that differ in an optical parameter value, but that, in addition to these two lens parts, a third lens part is gift. The quadrifocal lens is then constructed of three lens parts, which are in particular three parts of a bifocal lens. In particular, here, it is provided that the zones of the first two lens parts are arranged alternately in the radial direction, in which this is done in particular up to a diameter of 4,245 mm. Then, being radially contiguous outward, the third lens part is annularly contiguous. This third lens part, which is also bifocal, then preferably extends to a total diameter of about 6 mm, in particular 5,888 mm. That third bifocal part of the lens is also formed composed of at least one zone, in particular a plurality of zones, where each zone in turn has a main and a phase subzone. Preferably, the adding power of the third lens part is 3.33 diopters. This corresponds to the average of the two values 3.75 and 3.1 diopters of the first two lens parts.
[00072] Preferably, the relative distance intensity in the areas of the third lens part is 65%.
[00073] Such an implementation of a quadrafocal lens with a third radially outward lens part with the specific values mentioned should be especially advantageous if a large pupil of the eye is present, into which the intraocular lens must be inserted. Since with large pupils the intensity of far and near and less intermediate intensity are important and come forward, such a configuration with a third lens part is advantageous.
[00074] In an additional implementation of a lens, which can
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18/45 be indicated as a quadrifocal lens, unlike the aforementioned implementation, in which this lens is composed of two lens parts, it is provided so that the relative distance intensities are not 90% and 40%, but preferably 85% and 39.5%. Preferably, this lens corresponds to the 50:20:30 ratios with respect to the relative intensities for the long range, mid range and near range. [00075] Also in this case, an additional implementation can still be provided, in which this is provided as the additional third part of the lens as explained in the implementation previously mentioned, in which here in particular an addition power of 3.33 diopters and a relative distance intensity of 65% is also provided again.
[00076] Also in this case, it can be provided that the adding power of the zones of the third lens part is 3.33 diopters. [00077] In an additional implementation, it can be provided that a quad-focal lens according to the above explanations is composed of merely two lens parts, which differ in a value of at least one optical parameter. Contrary to the specific explanations mentioned above, it can be provided here that the adding power is again 3.75 diopters in the first lens part and 3.1 diopters in the second lens part, however, the intensities of relative distance are 82% in the first lens part and 41.75% in the second lens part.
[00078] Also in this case, an additional modality can be formed for the effect that the quadrifocal lens is not composed of those parts of two lenses, but of three parts of lens. In this case too, here again it is provided that, in addition to the two lens parts with the alternating arranged zones from the inside seen in the radial direction, the third lens part is formed contiguous with these two lens parts outwardly in the direction radial. It is formed preferably
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19/45 with several zones, which are formed identically with respect to parameter values. In particular, here, it is provided that the relative distance intensity is again 65%. In this case too, the addition power can be 3.33 diopters.
[00079] In an additional embodiment, unlike the aforementioned quadrifocal lenses, a quadrifocal lens can again be provided, which is constructed of two lens parts. They differ in particular in the relative distance intensity of the modalities mentioned so far, in which the relative distance intensity of the first lens part is 86.5% and that of the second lens part is 40%. Or the values for the addition powers are analogous to the previously mentioned modalities.
[00080] Also in this case, an additional modality can also be provided, in which a third lens part is arranged radially contiguous outwardly in relation to the first two lens parts as a bifocal part of the lens for the quadrifocal lens. This third lens part preferably also includes a plurality of zones, however, which are identical with respect to the parameter values of the optical parameters. Also in this case, it can be provided in particular so that the relative distance intensity of the zones of the third lens part is 65%, in particular that the power of addition is also of
3.33 diopters.
[00081] It can also be provided that in all the modes previously mentioned with quadrifocal lenses made of three parts of a bifocal lens, the adding power of the third part of the lens is not 3.33 diopters, but 3.75 diopters. Especially if the average adding power of the first two lens parts is 3.33 diopters and the value of the adding power of the third lens part is 3.75 diopters. As a result, the intensities of near-peak power are lower for large pupils, but the distribution of
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20/45 intensity in the near field gets wider. However, the total energy of that power up close is not thereby influenced.
[001] Preferably, in the implementations just mentioned for quadrifocal lenses, it is provided that the first lens part has seven zones and the second lens part also has seven zones. Preferably, in implementations of a quadrafocal lens with three parts of a bifocal lens, it is provided that the number of zones of the third lens part is greater than 5, in particular greater than 10. In particular, this depends on the diameter of the pupil.
[00082] In particular, the multifocal lens is an eye lens, in particular a contact lens or more preferably an intraocular lens.
[00083] Both the specific values of the parameters specified in the documents and in the specification of the parameters and the ratio of the parameters to each other for the characterization of specific characteristics of the lens should be considered as included by the scope of the invention even within the scope of deviations, for example, due to measurement errors, system errors, DIN tolerances, etc., in such a way that in this context the indications that are related to an identity of the powers, the intensities from afar, the positional indications, the sizing and others must still considered to be identical even within the scope of an indication substantially.
[00084] Other features of the invention are apparent from the claims, the figures and the description of the figures. The characteristics and combinations of the characteristics mentioned above in the description, as well as the characteristics and combinations of the characteristics mentioned below in the description of the figures and / or shown in the figures alone are usable not only in
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21/45 respectively specified combination, but also in other combinations or alone without departing from the scope of the invention.
Brief Description of the Drawings [00085] The modalities of the invention are explained in more detail below by schematic drawings. There are shown: [00086] figure 1 - a schematic representation of a partial section of a lens cross section of a known trifocal lens according to EP 1 194 797 B1, which is constructed from identical zones;
[00087] figure 2 - a diagram representation, in which the relative intensity of the lens powers for a trifocal lens according to figure 1 is shown;
[00088] figure 3 - a schematic cross-sectional representation of a bifocal lens according to EP 1 194 797 B1, in which the identical zones of the lens are configured in such a way that the lower relative intensity of the two powers has a value intended;
[00089] figure 4 - a schematic representation of a partial section of a cross section of an additional bifocal lens according to patent EP 1 194 797 B1, in which the identical zones of that lens are configured in such a way that the relative intensity in the the lesser of the two powers has a different additional value compared to the representation according to figure 3;
[00090] figure 5 - a schematic representation of a partial section of a lens in cross section according to an embodiment of the multifocal lens according to the invention;
[00091] figure 6 - a diagram, in which the relative intensities of the lens powers according to figure 5 are shown;
[00092] figure 7 - a diagram, in which the powers of the main lens sub-areas according to figure 3 and figure 4 are shown
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22/45 as a function of the relative intensity of the lesser power (power from a distance) for some exemplary proportions of the main sub-areas in relation to the total zone and for an addition power of 4 diopters;
[00093] figure 8 - a diagram, in which the relative intensities of the main powers of a lens according to figure 5 are represented;
[00094] figure 9 - an enlarged representation of a section of an anterior face of a lens modality according to the invention, in which the representation without steps is represented substantially in scale with respect to dimensions and geometry; [00095] figure 10 - a schematic representation of a partial section of an additional embodiment of a lens according to the invention, which is formed as a possible quadrifocal lens;
[00096] figure 11 - a diagram, in which the relative intensities of the main powers of the lens according to figure 10 are represented;
[00097] figure 12 - a diagram, in which the relative intensities of the main powers of a lens according to the invention according to the embodiment in figure 5 are represented, in which that lens is constructed from the zones of two parts of the lens, which respectively have different addition powers and respectively different relative relative intensities;
[00098] figure 13 - a schematic plan view of an embodiment of a lens according to the invention;
[00099] figure 14 - a schematic partial section of the lens according to figure 13 in a representation in longitudinal section;
[000100] figure 15 - a diagram, in which the relative intensities of the main powers of a lens according to the invention according to the modality in figure 16 are represented, in which this
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23/45 quadrifocal lens is constructed from the zones of two lens parts, which respectively have different addition powers and respectively identical relative distance intensities, as well as distinctly sized optical surfaces respectively;
[000101] figure 16 - a schematic representation of a partial section of a lens according to figure 15 in cross section according to an embodiment of the multifocal lens according to the invention;
[000102] figure 17 - a plan view of a partial section of an additional embodiment of a lens according to the invention; and [000103] figure 18 - a diagram, in which the relative intensities of the main powers of a lens according to figure 17 are represented, in which that quadrifocal lens is constructed from the zones of three parts of the lens, which respectively have powers of different addition and respectively different relative relative intensities.
Preferred Implementation of the Invention [000104] In the figures, similar or functionally similar elements are indicated with the same reference characters.
[000105] In figure 1, in a sectional representation, a part of a trifocal lens 1 with diffraction and refractive powers known from the prior art according to EP 1 194 797 B1 is shown. Lens 1 has a longitudinal chromatic aberration in both the smallest and the largest of the three main powers, as shown in the dashed curve in figure 2. In figure 2, on the vertical axis, the relative intensity is plotted and on the horizontal axis the lens power on diopters. The relatively large Ir intensities of the three main powers are apparent, in which the solid line is represented for monochromatic light at a design wavelength of 550 nm, and the dashed line is taken as a basis for polychromatic light with a distribution Gauss in the wavelength range between 450
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24/45 nm and 650 nm. The intensity for 450 nm and 650 nm, respectively, is 20% of the maximum intensity for 550 nm.
[000106] As explained in detail for these configurations in EP 1 194 797 B1, the lens 1 according to figure 1 is composed of the zones 2 and 2 'equal in the area, which are formed annularly and each of which it has the main subzones 3 and 3 'and the phase subzones 4 and 4'. The zones 2 and 2 'seen radially from the central axis A and thus upwards in the representation according to figure 1, are virtually numbered in their order and the odd zones 2 are formed in such a way that, for example, the smallest Diffractive powers correspond to the average refractive power of zones 2. On the other hand, then, the average refractive power of even zones 2 'corresponds to the greatest diffractive power. Due to this configuration, lens 1 according to figure 1 has a longitudinal chromatic aberration AM both the largest and the smallest of the main powers, as is also apparent in figure 2. On the rear side of lens 1, the profile or contour it is formed in such a way that in a zone 2, the phase subzone 4 extends obliquely backwards with respect to the contour of the main subzone 3. In the adjacent zone 2 ', this is exactly the reverse, in such a way that the contour of the phase subzone 4 'then extends again obliquely forward with respect to main subzone 3' of additional zone 2 ', such that elevations and depressions are formed virtually alternately.
[000107] In figure 3, the topographic profile of a bifocal lens 5 according to EP 1 194 797 B1 is shown schematically in a partial section. This lens 5 has a certain distribution of relative intensity between two main powers, for example, 40% for the smaller power (power from afar). For example, the bifocal lens 5 has a lower power (power from a distance) of 20 diopters and a greater power (power from a distance) of 24 diopters. The adding power of the lens
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25/45 is therefore 4 diopters. Lens 5 is constructed of identical zones 6, which in turn are divided into main sub-zones 7 and phase 8 sub-zones. The powers in sub-zones 7 and 8 are selected in such a way that the average power of zone 6 is weighted by the proportions of the percentage of area p1 and 1 - p1, respectively, is equal to the smaller of the two main powers of lens 5.
[000108] In figure 4, the topographic profile of an additional bifocal lens 9 according to EP 1 194 797 B1 is shown schematically in a partial section. This lens 9 is made up of identical zones 10 with main sub-zones 11 and corresponding phase 12 sub-zones. The bifocal lens 9 according to figure 4 exemplarily has the same main powers as the lens 5 according to figure 3, but a different intensity division between the greater and the lesser of the two main powers. This means that the refractive powers in main sub-areas 7 of lens 5 are different from the refractive powers in main sub-areas 11 of lens 9; and each of the refractive powers in phase 8 and 12 subzones is also different.
[000109] In figure 5, in a schematic representation, a longitudinal section is shown through a multifocal lens modality 13 according to the invention, in which only a section of lens 13 is shown. Lens 13 is a trifocal lens and therefore has n = 3 main powers. Lens 13 has a first lens portion 15 and a second lens portion 16. The first part 15 of the lens is constructed from a plurality of plural annular zones. Each annular zone 6 has a main subzone 7 and a phase 8 subzone. The percentage of area percentage p1 and thus the size of the optical surface and thereby a respective total annular surface of a phase 8 subzone of a zone 6 is, for example, between 8% and 17% of a total area of an area 6. For
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26/45 on the other hand, then, the area ratio and thus the size of the optical surface of a main sub-area 7 is equal to 1 - p1. With respect to the proportions of the area, this is considered with respect to an anterior face 14 of lens 13. The entire optical surface 151, which is an annular area of a zone 6, is identified as the entire optical surface 161, which is also a annular area of a zone 10.
[000110] Lens 13 is constructed for the purpose that the second part 16 of the lens has a plurality of identical annular zones 10, in which also in this case each zone 10 has a main subzone 11 and a phase subzone 12. Also in this case , with respect to the front face 14 of the lens 13, a p2 ratio of the area to the phase 12 subzone and a 1 - p2 ratio of the area to the main subzone 11 are formed. For example, also in this case, the p2 proportion of the area is comprised between 8% and 17% of the total area of zone 10. According to the representation, it can be appreciated that in the radial direction of the lens 13 and thus perpendicularly upwards in the representation according to figure 5 with respect to the horizontal axis A ', the zones 6 and 10 are arranged alternately and thereby alternately. In this way, lens 13 is constructed as a combination of different zones 6 and 10 alternately arranged adjacent and contiguous to each other. In the modality, it is provided that each zone 6 has respectively only one main sub-area 7 and respectively only one phase 8 sub-area, where in particular it is also provided for the phase 8 sub-zones of zones 6 to be formed at the edge of the annular shape of a zone 6, in particular formed radially and contiguous with the edge of the outer zone of a zone 6. A similar configuration applies to zones 10 of the second part 16 of the lens.
[000111] It can also be provided for zones 6 of the first lens part and / or zones 10 of the second lens part to be
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27/45 formed distinctly with respect to their number of main sub-areas 7 and / or 11 and / or with respect to their number of phase 8 and / or 12 sub-areas. Similarly, the local positions of phase 8 and 12 sub-areas, respectively , in zones 6 and 10, respectively, can also be different.
[000112] The front face 14 of the lens 13 is formed without topographic and optical steps or discontinuities, which means that the contour of the front face 14 is continuous. Furthermore, such a lens formed without steps 13 also implies that the front part of the wave behind lens 13 is continuous. The front face contour 14 is configured in such a way that the direction of the contour of a phase 8 sub-area of a zone 6 is directed towards the rear side 17 of the lens 13 and joins the contour of a main sub-area 11 of the zone radially subsequent 10. The same applies to all zones 6 and all zones 10. This is an example. It can also be provided so that each of the contour extensions of all phase 8 sub-zones is directed forward. It is essential that all are oriented in one direction.
[000113] In the embodiment, a rear face 17 of the lens 13 is formed aspherically. It can also be provided so that the posterior face 17 is formed corresponding to the anterior face 14 and that the anterior face 14 is formed corresponding to the aspheric configuration of the posterior face 7 according to the representation in figure 5. Thus, in the radial order, the lens 13 is composed in particular of odd zones, which correspond to zones 6 of the first part 15 of the lens, and even zones, which correspond to zones 10 of the second part 16 of the lens. The optical surface 151 of a zone 6 is also sized as an optical surface 161 of a zone 10. In addition, the optical surfaces 151 of all zones 6 are also sized. The corresponding applies to the optical surfaces 161 of all zones 10.
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28/45 [000114] In figure 9, in an enlarged representation, the contour or profile of an anterior face 14 of an additional implementation of a lens according to the invention is shown in scale with respect to the other size ratios. The configuration without steps can be appreciated.
[000115] In figure 6, a diagram is shown, in which the relative intensity IR is represented as a function of the D power of the lens 13. Thus, figure 6 shows TFR or axial PSF of the lens according to figure 5; the results apply to a lens diameter of 6 mm. The odd zones 6 of the lens 13 according to figure 5 correspond to a bifocal part 15 of the lens according to a lens analogous in figure 3 with a relative distance intensity of 40%. The even zones 10 of the lens 13 according to figure 5 correspond to a bifocal part 16 of the lens according to a lens analogous to that of figure 4 with a relative distance intensity of 50%. As is apparent, lens 13 according to figure 5 has a low intensity focus in the center between the identical long distance focus (example: 20 diopters) and the identical close focus (example: 24 diopters) of the two lenses accordingly with figure 3 and figure 4. The solid curve K1 identifies the relative intensity of the main powers of lens 13. The curve K2 shows the relative intensity of a lens that has only zones 6 (part 15 of the lens) with an intensity of relative distance of 50%. The K3 curve shows the relative intensity of a lens that has only 10 zones (part 16 of the lens) with a relative distance intensity of 40%. For better perceptibility, each of the K2 and K3 curves of the two bifocal lens parts 15 and 16 of the lens is shifted by 0.1 and 0.2 diopters, respectively.
[000116] EP 1 194 797 B1 describes how the Dg powers of the main sub-zones and the Ds powers of the phase sub-zones are to be determined at a desired relative intensity of the least power
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29/45 (power from afar). As explained, these powers are also dependent on the proportion of area p of the phase sub-areas and the proportion of area (1-p) of the main sub-areas in relation to the total annular zones of the lens, respectively.
[000117] Figure 7 indicates the association between the difference Dif of the DG refractive power of the main sub-area and the desired distance power depending on the relative intensity Ir of the distance power for exemplary proportions of the area of the main sub-areas in the total zones and for the exemplifying addition power of 4 diopters. This association can be determined according to the EP 1 194 797 B1 explanations for all the proportions of the main sub-areas in relation to the total annular zones. For example, the K4 curve is there for an addition power of 4 diopters and an area ratio of 95% of the main sub-area, the K5 curve is there for an addition power of 4 diopters and an area ratio of the main sub-area of 90%. %, and the K6 curve is for an addition power of 4 diopters and an area ratio of the main sub-area of 85%. The K7 curve applies to an addition power of 2 diopters and a 95% proportion of the main sub-area.
[000118] For the sake of simplification and clarity, it is now defined as follows.
[000119] It is clear that an individual zone 6 or zone 10 does not represent a lens 13, which has powers of refraction and diffraction. Instead, a lens 13 with refractive and diffractive powers is made up of at least two zones 6 and 10. However, for the sake of simplicity, it now refers to zones 6 or part of a bifocal lens 15 or zones 10 or part of a bifocal lens 16, which have a higher power and a lower power.
[000120] Figure 8 shows the axial TFR or PSF of a trifocal lens according to figure 5, in which the odd zones 6 have a
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30/45 relative distance intensity of 86% and uniform zones 10 have a relative distance intensity of 40%. As is apparent, in this lens 13, the intensity of the intermediate focus is considerable. The solid curve shows the power intensity distribution for monochromatic light at a wavelength of 550 nm. Figure 7 also shows the results for polychromatic light according to a Gaussian distribution in the wavelength range between 450 nm and 650 nm according to the dashed curve. From there, it can be appreciated that the smallest of the three main powers has no longitudinal chromatic aberrations. The results in figure 8 apply to a lens diameter of 6 mm.
[000121] In figure 9, as already mentioned above, a section of the anterior face 14 of an intraocular lens 13 of 20 power diopters from afar is shown in scale. Each of the main sub-area parts of zones 6 (odd zones) and 10 (even zones) is 85%. The relative distance intensity of zones 6 is 86%, and that of zones 10 is 40%. The refractive index of lens 13 is 1.46. As shown in Figure 9, this lens 13 has no topographic step, but only smooth, barely noticeable transitions between the main sub-areas; these transitions are formed by the respective phase subzones. Unlike conventional diffraction lenses, the lenses of the present invention have no topographic step. These topographic steps are required in diffraction lenses in order to produce differences in optical path length between the wave fronts of the individual zones. The wavefront behind a diffraction lens, therefore, is discontinuous, whereas the wavefront behind a lens according to the present invention is continuous.
[000122] Figure 10 schematically shows an implementation of a quadrifocal lens 18 constructed from three different parts of the lens, in particular the bifocal lens parts 15, 16 and 23 of the lens. Each
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31/45 one of the lens parts 15 and 16 has a plurality of zones 6 and 10, as already explained above. The third lens part 23 also has a plurality of zones 19, each of which, in turn, is constructed of a main subzone 20 and a phase subzone 12. The lens parts 15, 16 and 23 have three intensities of different relative away. The intensities from afar are formed in pairs with a difference of more than 10%. In a lens 18 according to figure 10, the zones with the numbers 1, 4, 7. (1 + 3 * m) in radial order are the zones 6, still the zones with the numbers 2, 5, 8 .. (2 + 3 * m) are zones 10, and finally zones with numbers 3, 6, 9 .... (3 + 3 * m) are zones 19 with sub-areas 20 and 21 (m = 0, 1,2.). Each of these three parts of bifocal lens 15, 16 and 23, respectively, has the same power from far and near in the modality. At least each two of the three lens parts 15, 16 and 23 have different relative distance and near intensities, respectively. The proportion of the percentage of area p3, and thus the size of the optical surface of the phase 21 sub-area, is in particular between 8% and 17%. In this way, the 1-p3 ratio of main sub-area 20 is between 83% and 92%. The optical surfaces 151, 161 and 191 of zones 6, 10 and 19 are also dimensioned. All zones 19 have equally sized optical surfaces 191, which are annular surfaces.
[000123] The TFR or axial PSF of a lens according to figure 10 are shown in figure 11. In this example, zones 6 with numbers 1, 4, 7 ... have a relative distance intensity of 86% , zones 10 with numbers 2, 5, 8. have a relative distance intensity of 75%, and zones 19 with numbers 3, 6, 9. of 9%. The results in figure 11 apply to a lens diameter of 5.75 mm. The solid curve again indicates the intensity of the powers with monochromatic light of wavelength 550 nm, where the dashed line shows the intensity of a polychromatic light between 450 nm
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32/45 and 650 nm (Gaussian distribution).
[000124] Other intensities from far and near relative to zones 6, 10 and 19, respectively, result in other relative intensities in the four maximum values of figure 11.
[000125] As already explained in EP 1 194797 B1, the difference AD between the higher power D2 (close power) and the lower power
D1 (power from afar), that is, the addition power of a bifocal lens formed of annular zones with at least each of a main subzone and at least one phase subzone, is:
AD = (1) [000126] In equation 1, λ is the wavelength of the design (for example, 550 nm), N is the number of equal annular zones in the total area or zones, and B is the diameter of the lens, where the annular zones are located. With the N zones of the same area as the area of each FZ in a diameter B, the AD addition power is thus provided by:
AD =
Fz (2) [000127] Thus, the addition power is inversely proportional to the Fz surface area of the total zones. The total zones have a power profile that is provided by the DG refractive power in the main sub-areas and the DS refractive power in the phase sub-areas, as shown in EP 1 194 797 B1. Since this power profile repeats in each zone of the FZ area, the power profile is called periodic in Fz.
[000128] If the zones of a lens according to the patent EP 1 194 797 B1 with a relative distance intensity I1 and a certain addition power are now combined alternately with the zones of a lens according to the patent EP 1 194 797 B1 with a relative distance intensity I2 and the same addition, thus
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33/45 both zones according to EP 1 194 797 B1 have an average refractive power Di (distance power). Due to different relative relative intensities, however, each of the two zones has different powers in the main sub-zones and in the phase sub-zones. In figure 7, the dependence of the powers in the main sub-zones on the relative distance intensity is shown as an example for bifocal lenses with 4 added power diopters. The powers in the phase subzones can be calculated from the power away from the lens (which corresponds to the average power of the total zones) and the powers in the main subzones.
[000129] As shown in EP 1 194 797 B1, the following relationships apply to the Dav medium distance power and the Dg and Ds refractive powers:
d. = D _a (1 -p) + D _s p ⁽³⁾ where p is the percentage of the area of the phase sub-area in relation to the total zone, and where DG is the refractive power of the main sub-area, and DS is the refractive power of the phase subzone. As an example, it should be required that the relative intensity of the far-off power is 70%, and the far-off power must be 20 diopters; furthermore, the p-proportion of the phase sub-area must be 0.15 or 15%, and the proportion of the main sub-area must then be 85%. Based on figure 7, the value of 1.8 diopters is obtained for the difference between the power of the main sub-area and the power from far away. In this way, the value Dg = 21.8 diopters is obtained, and with the aid of formula 3 above, the value Ds = 9.8 diopters. Similarly, for a relative distance intensity of 60% instead of 70%, the values Dg = 22.2 diopters and Ds = 7.53 diopters are obtained.
[000130] The respective differences in the main sub-zones and phase sub-zones are small, as is apparent from figure 7 or these examples, if the differences in intensities by far
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34/45 relative Ii and I2 are not large. In these cases, the total zones with relative distance intensity I1 differ slightly from the total zones with relative distance intensity I2. Therefore, the periodicity of the power profile is maintained substantially, that is, the difference between the powers is further determined by the Fz area of the individual zones - with slightly different powers in the sub-zones. Figure 6, which applies to a lens, where the zones with I1 = 40% are combined with the zones with I2 = 50%, thus substantially shows a TFR or an axial PSF of a bifocal lens with added power which corresponds to the Fz area. The slight differences in the sub-zones of the two consecutive zones 6 and 10 cause only slight variations in the characteristics of this lens.
[000131] However, if the relative distance intensities I1 and I2 in consecutive zones differ substantially, then the periodicity disturbance in Fz is considerable. On the other hand, it results in a periodicity of the power profile given by the surface area of two adjacent zones, thus by 2 * Fz. In this way, lenses 13 or 18 composed of total zones, for which each of the relative distance intensities I1 and I2 is substantially different, have an addition power that is provided by
Λ Π = 2 F ⁽⁴⁾ [000132] The individual powers for an exemplifying lens 13
with two lens parts 15 and 16 are now specified as
Follow.[000133]lens 13. D1 is the smallest of the main powers (power by far) of [000134] Dg1 is the refractive power in main sub-area 7 of the first
zone 6 (and 3a, 5a, ... zone) and Ds1 is the refractive power in the first zone 8 subarea phase 6 (e 3a, 5a, ... zone).
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35/45 [000135] pi is the area ratio of the phase 8 sub-area to the first total zone 6 (and 3 ^a , 5 ^a , ... zone).
[000136] Dg2 is the refractive power in the main subarea 11 of the second zone 10 (and 4a, 6a, ... zone) and Ds2 is the refractive power in the phase 12 subarea of the second zone 10 (and 4a, 6a, ... zone).
[000137] p2 is the area ratio of the phase 11 sub-area to the second total zone 10 (and 4a, 6a, ... zone).
[000138] Then it applies:
D1 ⁼ DG1 ^{(1 -} PÒ ⁺ DS1P1 ⁼ DG2 ^{(1 -} Pl) ⁺ DS2P2 ⁽⁵⁾ [000139] The average refractive power Dg12 of the first two main sub-areas Dg1 and Dg2 and Ds1 of the phase sub-area of a total zone 22 ( Figs. 13 and 14) composed of a zone 6 of the first lens part 15 and an adjacent zone 10 of the second lens part 16 is provided by
DG12 ¹ - P1 ^{2 - p} 2 ^ DS1
P1 ^{2 - p} 2 ^ DG 2 ^{1 - p} 2 ^{2 - p} 2 (6) [000140] The power Dg12 corresponds to the power of the main sub-area of a total zone 22 with surface area 2 * Fz, the power of the sub-area of phase of the total zone with the surface area of 2 * Fz is Ds2, however, the proportion of area of that phase sub-area in relation to the total zone 22 with surface area of 2 * Fz is now p12 with
P2 (7) since the double area 2 * Fz now serves as a reference.
[000141] By a combination of two zones 6 and 10 of each identical surface area Fz (equally dimensioned optical surfaces) of two different lens parts 15 and 16, in addition, total zones 22 with a 2Fz surface area now appear . These zones 22 have an average principal subarea power of Dg12, where the power of the
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36/45 phase subzone of these combined zones is Ds2. These phase sub-zones now have a ratio P12 to total zone 22. Since the area of that total zone 22 is twice as large as the area of the two individual zones 6 and 10, the addition of these combined zones 22 according to equation 2 is half.
[000142] Total zone 22 with a surface area of 2 * Fz thus has a main sub-area power Dgi2, which is an average power according to equation 6. The power of the phase sub-area of this zone is Ds2. If the Dgi2 power were a homogeneous uniform power, then zone 22 with a surface area of 2 * Fz would be a zone of a bifocal lens with the ADn addition power according to equation 4.
[000143] By combining zones 6 with the surface area of Fz and the powers Dgi and Dsi with zones 10 with the surface area of Fz and powers Dg2 and Ds2, a lens with three main powers is obtained, the smallest of which is a refractive power without longitudinal chromatic aberration.
[000144] The combination of similar zones (zones 6 or zones 10) of a lens according to EP 1 194 797 B1 results in a bifocal lens. The combination of zones 6 and 10 with respectively different relative distance intensities - as explained above - and in particular with a specific distance difference of more than 10% results in a trifocal lens 13.
[000145] In particular, zones 6 and zones 10 are combined together in such a way that the resulting lens 13 has the same power from afar and the same power from close up as lenses composed exclusively of zones 6 or exclusively of zones 10 If the difference in relative distance intensities of zones 6 and zones 10 is large enough, then the resulting lens is trifocal, that is, it has an additional intermediate power. In order that the smallest of these three main powers does not have any chromatic aberrations
Petition 870190135499, of 12/18/2019, p. 44/104
37/45 longitudinal, the average refractive powers of zones 6 and 10 have to be identical to that lower power. Analogous facts apply to the lenses of the invention, which have more than three main powers, for example, a quadrifocal lens 18 (figure 10). In contrast to this, the zones of a trifocal lens according to EP 1 194 797 B1 have medium refractive powers, which are different.
[000146] If the zones with respectively different relative distance intensities and respectively identical mean refractive powers are now combined according to figure 10, in this way, an implementation of a quadrifocal lens 18 is obtained. The lens 18 has an anterior face 14 ', in which in the third part 23 of the lens constructed of the annular zones 19 the phase sub-area 21 has a percentage of area p3 in relation to the total area of a zone 19. In figure 11, the TFR or the axial PSF of such a lens 18 are shown. The relative intensity IR and the power D are plotted. In this example, the relative distance intensities in the three different zones 6, 10, 19 or in the lens parts 15, 16 and 23 are 86%, 75% and 9%, respectively. The results in figure 11 apply to the diameter of 5.75 mm. The solid curve is again for monochromatic light with a wavelength of 550 nm, the dashed curve is for polychromatic light between 450 nm and 650 nm (Gaussian distribution).
[000147] Depending on the radial position of a zone 6 of the first lens part 15, it can be provided so that the area ratio p1 varies in such a way that in an internal zone 6 the proportion p1 of a phase 7 sub-area may be different of a p1 ratio in another outer zone 6. The same applies to zones 10 of lens part 15 and, if present, to zones 19 of lens part 23.
[000148] Similarly, the powers and thus the power profiles of the respective zones 6, 10 or 19 can be continuous or
Petition 870190135499, of 12/18/2019, p. 45/104
38/45 batches. They can be constant or radius dependent.
[000149] Generally, it is applied that the combination of n> 2 dissimilar zones or parts of dissimilar lenses, each of which has at least one zone with respectively different relative intensities of distance Ii, I2 In and mean refractive powers respectively identical results in a lens, which has (n + 1) main powers, in which the smallest of these main powers has no longitudinal chromatic aberration, and which corresponds to the average refractive power of all n dissimilar zones.
[000150] In all the lenses discussed above with n> 2 main powers and n - 1 lens parts, the powers of distance and the powers of addition of the individual lenses or lens zones were identical, only the relative distance and near intensities. the zones were different, respectively.
[000151] Lenses with n> 2 main powers and n - 1 lens parts are also covered by the invention, which have respectively different relative relative intensities, respectively identical mean refractive powers, but different addition powers. An example is a lens also according to lens 5, which includes odd zones 6 according to figure 3, in which the distance power is 20 diopters, the addition power is 4 diopters and the intensity is far relative is 40%. The even zones 10 of that lens are zones of a lens according to figure 4, which has a power of 20 diopters far, an addition power of 2 diopters and a relative distance intensity of 60%. The TFR or axial PSF of this lens is shown in figure 12. From the results for a polychromatic light between 450 nm and 650 nm (dashed curve), it can be seen that again the smallest of the main powers has no longitudinal chromatic aberration. The solid curve is for monochromatic light with a wavelength of 550 nm. The results
Petition 870190135499, of 12/18/2019, p. 46/104
39/45 apply to a lens diameter of 3.6 mm.
[000152] It must be emphasized the fact that, in all the lenses discussed, the smallest of the various powers (power by far) is free from longitudinal chromatic aberration. This fact is apparent from figures 8, 11 and 12 and 15, in which the corresponding functions are also shown for polychromatic light.
[000153] The relative intensities of the individual powers of the lenses can be varied by the corresponding choice of the relative relative intensities of the individual zones. If certain relative intensities in the individual powers are desired, in this way, they can be obtained by systematically varying parameters such as individual relative distance intensities of the zones and the individual addition powers of the zones (trial and error method).
[000154] In figure 13, a schematic plan view of lens 13 is shown, in particular not in scale with respect to the area sizes of zones 6 and 10, while it is shown partially in longitudinal section according to the sectional line VV in the figure 5. The first lens part 15 and thus the sum of the zones 6, some of which are shown in figure 13, constitutes a bifocal lens part 15. Correspondingly, in the implementation according to figure 13, the second part lens 16 is formed with a plurality of zones 10, which also constitute a bifocal lens part. Lens 13 with its three main powers is therefore constructed of two parts of bifocal lens 15 and 16. Each of them has a plurality of zones 6 and 10, respectively. They are arranged alternately with each other. All zones 6 of the first lens part 15 have an identical area FZ. Similarly, all zones 10 of the second lens portion 16 have the same area Fz. This can be seen with respect to the configuration of the area on the front face 14 of lens 13. Thus, in the mode, two adjacent zones 6 and 10 are formed from
Petition 870190135499, of 12/18/2019, p. 47/104
40/45 two different bifocal lens parts 15 and 16 with the same Fz areas. The two adjacent zones 6 and 10 of the two different lens parts 15 and 16 constitute a total zone 22. With respect to the average refractive power of such a total zone 22 with respect to its power of the main sub-area as well as with respect to the power of the sub-area phase, reference is made to the explanations mentioned above. In figure 14, in an additional sectional representation, a partial section is shown, in which a total zone 22 is represented. Such a total zone 22 can also be formed in other locations of the lens 13 between a zone 6 and a zone 10. The configuration according to figure 14, as well as the previously explained associations of the equation, therefore also apply to all other pairs of zones with a zone 6 and a zone
10. By main sub-area 7 and 11 and by phase 8 sub-area, a total main sub-area of total zone 22 is formed. Phase 12 sub-area, which locally represents the radial outer sub-area, is the total phase sub-area of total zone 22 .
[000155] In figure 16, an additional example of a quadrifocal intraocular lens according to the present invention is shown. This lens 24 corresponds to Figs. 13 and 14 in its construction. Therefore, the lens is constructed only of two bifocal lens parts 25 and 26. Lens part 25 includes several, in particular two, annular zones 27, which are configured in such a way that the average refractive power is 21 diopters and the greater of the two powers is 24.5 diopters. Thus, the addition power is 3.5 diopters. The lens portion 26 includes several, in particular two, annular zones 28, which are formed in such a way that the average refractive power is also 21 diopters. However, the addition power is 1.75 diopters. In all zones 27 and 28, the relative distance intensity is 50%. All parts of the bifocal lens and 26 thus have equally high intensities in the two main powers. Zones 27 and 28 are arranged alternately
Petition 870190135499, of 12/18/2019, p. 48/104
41/45 in the radial direction.
[000156] Also in this case, an anterior face 14 is formed, which represents an optical surface of the lens 24. However, zones 27 and 28 respectively have only one main sub-area 29 or 31 and respectively only one phase sub-area 30 or 32 in the modality. The sub-zones of phase 30 and 32 are arranged radially outward and are contiguous with the respective outer edge of the zone in the respective zones 27 and 28, respectively. A zone 27 has a total optical surface 251, where a zone 28 has a total optical surface 261. Optical surfaces 251 and 261 are distinctly sized, where surface 261 is at least 50%, and in particular 100% larger than than the surface 251. The odd zones 28 counted outwardly in the radial direction are therefore substantially larger in the area than the even zones 27. The percentage proportions of area p4 and p5 of the sub-zones of phase 30 and 32 are preferably understood between 8% and 17%.
[000157] Now, this lens is positioned virtually behind a single surface cornea with a power of 43 diopters with an anterior chamber depth of 4 mm (the depth of the anterior chamber is a distance between the center of the cornea and the anterior face intraocular lens). The index of the immersion medium surrounding the intraocular lens is 1.336 (standard value). The variable power of the system composed of the cornea and the intraocular lens is shown in figure 15. This power is also known as ocular power. As is apparent from Figure 15, the combination of two lens parts 25 and 26 respectively with far identical power, but respectively with different adding power and in particular with different optical surface sizes, results in a lens quadrifocal intraocular. The least of the four powers corresponds to the least power of the lens parts 25 and 26 and is free from longitudinal chromatic aberration, the largest
Petition 870190135499, of 12/18/2019, p. 49/104
42/45 of the four powers corresponds to the greater of the two powers of the lens part 25, and the second lesser of the four powers corresponds to the greater of the two powers of the lens part 26. Another power located between the greater and the second lesser of the four powers is attributable to interference phenomena between all areas of the lens. The example according to figures 15 and 16 thus shows that, by combining only two parts of bifocal lens 25 and 26, quadrifocal lenses can also be provided.
[000158] In the present description, preferred implementations of the lenses according to the present invention have been described by way of example. Naturally, the invention is not restricted to the modalities discussed. To the element versed in the technique, it is immediately understandable that there are other modalities, which do not deviate from the basic idea of the present invention.
[000159] In the representation of a lens 33 in figure 17, the third part of external bifocal slow that is contiguous in the radial direction to the first two parts of the lens is not represented. That third lens part is made up of a plurality of zones, each of which has a main subzone and a phase subzone. Preferably, the zones of that third lens part have an addition power of 3.75 diopters. The relative distance intensities of the zones of that third lens part are preferably 65%. Preferably, this third lens part extends over a diameter range between 4.245 mm and 6 mm from the entire lens.
[000160] In figure 17, each of the zones 34 of the first lens part and of the zones 35 of the second lens part which is composed of a main sub-area and a phase sub-zone is formed. As is apparent, in the radial direction, the zones 34 of the first lens part are arranged alternately with the zones 35 of the second lens part. In the implementation shown, the first lens part is constructed
Petition 870190135499, of 12/18/2019, p. 50/104
43/45 made up of seven zones 34 and the second lens part is also made up of seven zones 35. The adding power of the first lens part is 3.75 diopters and the adding power of the second lens part is 3.1 diopters. The two lens parts extend to a diameter of 4.245 mm on the lens 33.
[000161] The relative distance intensity in the zones 34 of the first lens part is 90% in the modality, where the relative distance intensity in the zones of the second lens part is 40%. The average refractive power of all zones is identical. The proportion of the optical surface area of the main sub-area is 90% in all zones. This applies to both the first two lens parts and the third lens part.
[000162] As can also be seen from the representation in figure 17, a radial thickness d1 of the first zone 34 of the first lens part is greater than the radial thickness d2 of the next zone 35 of the second lens part. Other radial thicknesses d3 to d5 are shown, which correspond to additional zones 34, 35, respectively. The radial thicknesses d1 to d5 and so on are configured in such a way that all zones 34 have the same surface size and all zones 35 have the same surface size, which is different from the surface size of zones 34.
[000163] In an additional preferred general embodiment, all annular zones 34 have the same surface size. In addition, all annular zones 35 have the same surface size, which is different from the surface size of annular zones 34. Therefore, the radial thicknesses d1 to d5 and so on are different and decrease with the radius of the lens.
[000164] Based on the representation in figure 17, in the diagram according to figure 18 the intensity distribution of the relative intensity Ir is shown for the four main powers of the
Petition 870190135499, of 12/18/2019, p. 51/104
44/45 according to figure 17. The four substantial peaks or peaks with their relative intensity distributions are illustrated.
[000165] Based on the representation in figure 17, a quadrafocal lens that does not have the third external lens part and is not constructed in this way only composed of the first two lens parts can also be provided. Therefore, additional lens parts are not provided.
[000166] Based on the representation in figure 17 and the explanation of the quadrifocal lens composed of three lens parts, each of which is bifocal, a corresponding lens can be provided, in which the values for the addition powers are again 3.75, 3.1 and 3.33 or 3.75 for the first three lens parts. Contrary to the explanation above, here it can then be provided that the relative distance intensities are 85% for zones 34 of the first lens part, 39.5% for zones 35 of the second lens part and 65 % for the third part of the lens area. Also in this case, alternatively, a quadrifocal lens that is composed only of the first two lens parts can be provided.
[000167] Again and contrary to this case, two additional implementations can be provided for a quadrifocal lens, in which then only at different relative distance intensities, are 82% for the first lens part, 41.75% for the second lens part and 65% for the third lens part. In this case too, a quadrifocal lens can then be provided which is constructed composed only of the first two lens parts.
[000168] As an additional alternative quadrifocal lens, a lens can be provided, which again only differs in intensities from afar with respect to the previously mentioned example. Here, it can then be provided that the relative distance intensity of the first lens part is 86.5% and that of the second lens part
Petition 870190135499, of 12/18/2019, p. 52/104
45/45 is 40%. If a third lens part is present, its relative distance intensity is in particular again 65%.
[000169] In all implementations, the first innermost zone of the first lens part is also indicated as void.
Petition 870190135499, of 12/18/2019, p. 53/104
1/4

权利要求:
Claims (6)
[1]
1/11

[2]
11/11

[3]
3/11

[4]
4/11

[5]
5/11

[6]
6/11

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法律状态:
2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-02-27| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-04-22| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/04/2011, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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DE102010018436.5A|DE102010018436B4|2010-04-27|2010-04-27|Multifocal eye lens|

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PCT/EP2011/056552|WO2011134948A1|2010-04-27|2011-04-26|Multifocal lens|

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