• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Procedure, system and measuring device to design a pair of progressive ophthalmic lenses, manufacturing procedure and corresponding lenses. The lenses have a first area with its optical center (209, 211) for a first viewing distance, and a second zone its optical center (210, 212) for a second viewing distance, smaller than the first distance; each lens (6, 7) intended to have a position of use in front of a respective eye (1, 2) of the user, the method comprising the following steps: - determining an initial inset (203, 204) for each lens (6, 7); - determining a measurement of a user's binocular vision range; - determine a suitable diopter value to maintain said binocular vision range; - determine a design inset and design diopters, depending on the initial inset (203, 204) and the diopter value; - design each lens (6, 7) according to the design parameters. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2631478A1
    申请号:ES201631430
    申请日:2016-11-10
    公开日:2017-08-31
    发明作者:Julio VILLAVERDE ROSENDE
    申请人:Merindades Vision S L；Merindades Vision Sl；
    IPC主号:
    专利说明:

    5
    10
    fifteen
    twenty
    25
    30
    PROCEDURE, SYSTEM AND MEASUREMENT DEVICE FOR THE DESIGN OF A PAIR OF PROGRESSIVE OPHTHALMIC LENSES, MANUFACTURING PROCEDURE AND CORRESPONDING LENSES
    DESCRIPTION
    Field of the invention
    The invention is in the field of ophthalmic lenses.
    More specifically, the invention relates to a method of designing a pair of progressive ophthalmic lenses for a user, intended to present at least a first zone with a first optical center for a first viewing distance, and a second zone with a second optical center for a second vision distance, said second vision distance being less than said first vision distance; wherein each lens of said pair of lenses is intended to have a position of use in front of a respective eye of said user.
    The invention also relates to a method of manufacturing a pair of progressive ophthalmic lenses. Asl as a pair of progressive ophthalmic lenses.
    The invention also relates to a system for designing a pair of progressive ophthalmic lenses for a user. In the context of the invention the word "system" refers to a disposition of different elements or devices. The invention also refers to a measuring device for the design of a pair of progressive ophthalmic lenses.
    State of the art
    In the field of corrective lenses, the so-called monofocal lenses are intended to correct a user's visual defects, usually for a specific distance of vision.
    5
    10
    fifteen
    twenty
    25
    30
    In some cases, for example, when there is presbyopia (also called a tired view), the correction needed when the user looks from a distance is different from when the user looks closely. In situations in which the user must change frequently between far vision and near vision, this correction disparity means that he needs to change glasses, which can be tedious.
    For this reason, bifocal lenses appeared in which there are two areas of vision, and even multifocal, with several different zones. A common form of bifocal lenses is that the upper part is intended to look far away, and the lower part to look closely.
    However, this type of bifocal or multifocal lens has the main drawback that there is an abrupt change between the correction zones, which makes it impossible to adapt the vision correctly to intermediate points.
    For this reason, the so-called progressive lenses appeared, which have at least a first zone of distant vision and a second zone of near vision, with corridors between them that gradually adapt the graduation.
    In general, the far vision zone is adapted for the optical infinity, which in the human case is located approximately from 5m. It is also usual that the near vision area is adapted for the so-called working vision for near vision, usually between 35 and 45cm, for example, for reading documents. In this type of usual configurations, the far vision zone is usually located at the top of the lens and the near vision zone is usually at the bottom, while the aisles are in the intermediate zone.
    Since users often make their eyes converge towards the nose when looking closely, there should be a horizontal distance between the optical center of the far vision area and the optical center of the near vision area. This horizontal distance is called inset. Equally, the length of the aisles is called the vertical distance between the two zones.
    5
    10
    fifteen
    twenty
    25
    30
    Lens prescriptions may vary depending on the use for which they are intended, so there may be lenses in which the near vision is at the top because they are intended for work in which this configuration is required. There may also be lenses in which the far vision zone does not correspond to the optical infinity, but to an intermediate distance, generally between 50 and 80cm. This last type of lens is used, for example, in the case of work in which it is required to fix the view both on a computer screen and on closer reading documents. Sometimes this type of lens is also called regressive, however, for the sake of clarity, this document includes all of them in the concept of progressive lenses.
    In relation to the lenses, the focal length or focal length of a lens is the distance between the optical center of the lens and the focus, also called the focal point. Focal length can take positive or negative values.
    On the other hand, said focal point is the point where the parallel rays that cross the lens converge, in the case of converging lenses. Or an imaginary point from which the light beams that pass through the lens appear to emerge, in the case of divergent lenses. In the first case, the focal length is positive, while in the second case, the focal length is negative.
    The power of a lens is the inverse of the focal length, and is measured in diopters (m "1).
    The prescription of the power of the lenses for far vision and for near vision is usually performed by a professional using devices and procedures common in the technique to achieve correct diopter values in each case and for each eye, obtaining a pair of lenses that are mounted on glasses. However, despite this correct prescription, there are numerous users of progressive glasses that accuse symptoms such as lack of adaptation, headaches, dizziness, pain and / or redness of the eyes, etc.
    5
    10
    fifteen
    twenty
    25
    30
    The usual recommendation is that of a period of adaptation to progressive lenses, after which part of the symptoms usually remit. However, sometimes not all symptoms remit and there are even users who do not get used to the use of this type of lens.
    Description of the invention
    Unless otherwise indicated, this document considers a vertical direction corresponding to the vertical axis of the user's head, and a horizontal direction perpendicular to said vertical direction and which, except in the case of facial asymmetries, is defined by the horizontal axis that crosses both eyes of the user. Finally, it is considered a front-back axis, perpendicular to the previous axes. In the same way, the vertical plane whose normal vector has the horizontal direction will be called the nasal bisector plane. Where said nasal bisector plane divides the user's head through the bridge of the nose and thus defining a right part, corresponding to the user's right, and a left part, corresponding to its left. The vertical plane whose normal vector has the direction of the front-back axis and which crosses the nose through the support point of the spectacle frame will also be called the plane of the mount.
    As described above, the inset corresponds to the horizontal distance between the near and far zone in the glasses. In the context of the invention, progressive lenses are understood to be those lenses that have at least two vision zones at different distances and with an intermediate zone of gradual change between the two.
    Also, the position of use of the pair of lenses in the frame of the glasses may be inclined with respect to the plane of the mount both in the horizontal direction (pantoscopic angle) and in the front-back axis (galbe angle). For the sake of clarity, and unless otherwise indicated, the explanations contained in this document consider that both the pantoscopic angle and the galbe angle are null. He
    5
    10
    fifteen
    twenty
    25
    30
    A person skilled in the art will have no problem transporting the results described here to non-zero angles using trigonometric rules.
    The purpose of the invention is to provide a design procedure for a pair of progressive ophthalmic lenses of the type indicated at the beginning, its manufacturing procedure, design system, measuring device and pair of lenses that allow the user to adapt to the use of said lenses. glasses.
    In a first aspect of the invention, this purpose is achieved by a method of designing a pair of progressive ophthalmic lenses of the type indicated at the beginning, characterized in that it comprises the following steps:
    - determining an initial inset for each lens of said pair of lenses;
    - determine a measurement of a range of binocular vision for said user;
    - determine a diopter value for a compensation prism capable of maintaining said range of binocular vision;
    - determining horizontal design parameters for each lens, comprising a design inset and design diopters, depending on said initial inset and said diopter value for said compensation prism;
    - design each lens of said pair of lenses according to said horizontal design parameters.
    Thus, the technical effect of the lenses designed according to these characteristics is that of compensating the structure of the lenses to offer a vision with the greatest possible conditions of binocularity, in particular for said second vision distance. Indeed, in general, human beings are able to tolerate a certain range of diopters while maintaining binocular vision. In this range, the brain is able to fuse the images from each eye. Outside this range, vision becomes blurred or even looks double, which is known as diplopia.
    In the experience of the inventors in the field of ophthalmology, it has been found that the more the vision of binocular conditions is further removed, the more pronounced symptoms such as headache, dizziness, pain and / or redness of the eyes For this reason, the technical effect of maintaining binocularity causes
    5
    10
    fifteen
    twenty
    25
    30
    a decrease in symptomatology which in turn solves the technical problem of improving the user's adaptation to progressive lenses.
    In the art the ways of modifying the diopters of a lens are known, for example by introducing a prism of a certain power, or by moving the optical center of the lens by the so-called Prentice Law in which it is specified that the behavior of a The spherical lens with the optical center displaced a certain distance is equivalent to that of a prism whose power is proportional to that distance and the power of the lens. This is usually a preferred solution since it does not require the incorporation of a prism that could increase the weight of the lenses. However, its use in progressive lenses is not always possible, since these lenses have a complex structure to achieve a smooth transition between the vision areas. In this way, the expert will determine, depending on the lens and its experience, the convenience of said horizontal design parameters comprising one of the following options:
    - determining said design inset value as the result of modifying said initial inset based on a displacement indicated by the Prentice Law that allows obtaining said diopter value for said compensation prism, and determining said design diopter value as zero ; O well
    - determining said design inset value as said initial inset value, and said design diopter value as said diopter value for said compensation prism.
    On the basis of the invention defined in the main revindication, preferred embodiments are provided whose characteristics are set out in the dependent claims.
    As defined above, the optical infinity is usually a distance equal to or greater than 5m, while the near vision distance is usually between 35 and 45cm, both are usual interpretations in the art. In the art, the working distance range for medium distance is normally considered to be between 50 and 80cm. The optical infinity is used to reference a point located at this
    5
    10
    fifteen
    twenty
    25
    30
    distance at eye level, however, the user may find it more comfortable to tilt their head when looking at a distant point. In the context of the invention, this point is called a preferential infinity at a distance equal to or greater than 5m but which may be offset from the height of the eyes.
    In an advantageous embodiment, said first viewing distance is an optical infinity distance, or preferably, a preferential infinity distance; and said second distance is a working distance for near vision. In this way the lenses can be adapted for situations in which the user needs to see both long distance and near.
    In an alternative embodiment, said first viewing distance is a working distance for medium distance; and said second distance is a working distance for near vision. What allows to see from a medium range to a short range and is specially adapted, for example, for jobs in which the user must move the view between a computer screen and nearby documents.
    In an advantageous embodiment, determining said initial inset for each lens comprises determining an initial inset with a fixed value between 2.0 and 3.0 mm, more preferably 2.5 mm. This greatly simplifies the design procedure and the measures it requires when using fixed values.
    It is known as interpupillary distance or DIP, at the distance between the geometric centers of a user's pupils. On the other hand, the naso-pupillary distance corresponds to the distance between the pupil and said nasal bisector plane. It is also known as corneal apex, or corneal apex, to the outermost part of the eye, which corresponds to the most prominent point of the cornea with respect to the center of the eye,
    In another alternative embodiment, determining said initial inset for each lens comprises the following steps:
    - for each lens:
    5
    10
    fifteen
    twenty
    25
    30
    - determining a measurement of a vertex distance between the corneal apex of the eye corresponding to said lens and the position of use of said lens; Y
    - determining a value of a distance to the center between said corneal apex of the eye and a center of rotation of the eye;
    - determining a measurement of a first interpupillary distance for said first viewing distance;
    - determining a measurement of a second interpupillary distance for said second vision distance;
    - determining a pupillary path value as half of the difference between said first interpupillary distance and said second interpupillary distance; Y
    - determine the said initial inset value for each lens by projecting said pupillary path, considering said distance between said center of rotation and the position of use of said lens.
    The vertex distance is measured between the outermost part of the eye, called the corneal apex, and the lens in its position of use. However, from a calculation point of view it is necessary to know the distance to the center of rotation of the eye. This distance is not easily measured, however in the technique a value of 12mm is usually used as a reference, being able to use higher values for myopia eyes, and smaller values for eyes with farsightedness. By knowing the distance between the lens and the center of rotation, the pupillary path can be projected on the lenses, thus obtaining the initial inset.
    In this way, the initial inset is adapted to the morphological and postural characteristics of the user, which results in more precise values and improves the final result of the lenses designed for a specific user. Although it is not specified in the memory for the sake of clarity, in the event that the user's prescription requires high diopter values, it may be advisable to perform measurements with a lens on, otherwise the user may be unable to get to see the required point of vision.
    In another alternative embodiment, determining said initial inset for each lens comprises the following steps for each lens of said pair of lenses:
    5
    10
    fifteen
    twenty
    25
    30
    - determining a measurement of a first naso-pupillary distance for said first vision distance;
    - determining a measurement of a second naso-pupillary distance for said second vision distance;
    - determining a pupillary path value as the difference between said first naso-pupillary distance and said second naso-pupillary distance; Y
    - determine the said initial inset value for each lens by projecting said pupillary path, considering said distance between said center of rotation and the position of use of said lens.
    Thus, a separate measurement of the position of each eye is performed, which results in better precision in the result of the lenses, especially for users with facial or vision asymmetries.
    The area of the retina where the light rays are focused is known as fovea and is specially trained for color vision. Thus, directing the view towards an object means placing its optical image in the fovea.
    In the technique it is known as the Kappa angle to the angle between:
    - a geometric axis of the eye, which crosses the geometric center of the pupil of said eye; Y
    - an optical axis of the eye, which joins the central fovea of the retina of said eye with said point located at the distance of vision
    It is known that Emetropes users usually have a Kappa angle of about 5 °, hypermeters up to 10 ° or more, while in myopia the Kappa angle reaches 2 °.
    Preferably, when said user looks at a point located at said second viewing distance, each eye of said user has a Kappa angle, and in which determining said initial inset for each lens comprises the additional steps of
    - determining a correction of said initial inset for each lens according to said Kappa angle of each eye corresponding to each lens; Y
    - apply said correction to said initial inset.
    5
    10
    fifteen
    twenty
    25
    30
    Thus, given that the measurements that can be made are, as a general rule, only with respect to the geometric axis and not with respect to the optical axis, these characteristics have the effect of correcting the possible deviation between the two, resulting in greater precision in the initial inset determination.
    Preferably, said correction of said initial inset comprises subtracting 0.35mm if said eye has emetropla, subtract between 0.35mm and 0.7mm if said eye has hypermetropla, or subtract between 0.15mm and 3.5mm if said eye has myopia.
    In this preferred form, fixed values that correspond to the anterior angles and to usual distances between the eye and the lenses are used. Thus, the need for trigonometric calculations for these corrections decreases. The expert will understand that in the case of ranges, the choice of the specific value is carried out depending on the amount of myopia or hypertropic of the patient.
    It is known as foria to the latent deviation of the visual axes that manifests itself in the absence of visual stimulation. This is the state defined by the position of rotation of the eyes in binocular vision in which the fusion of the images is broken. It can be induced voluntarily or by some artifice, being a state of relaxation in which each eye momentarily loses its coordination with the other, maintaining the visual stimulus but without any integration in the brain. Orthophoria is usually talked about if the eyes are parallel, of exophoria if they are turned outwards, and of endophoria if it is inwards.
    Vergencias are called movements that make the eyes in a coordinated way necessary to maintain a stable binocular vision at any distance. There are two types of vergences, convergence and divergence. Convergence is the ability to divert both eyes to the nose, necessary to keep your eyes fixed at a nearby point. Divergence is the ability to divert both eyes outward, necessary to change the view from an object closer to a more distant object.
    Fusion vergence is the component that occurs when an object is seen in diplopia. When moving an object, it stops being merged (i.e.
    5
    10
    fifteen
    twenty
    25
    30
    haplopica, in which the brain fuses the images of each eye) and diplopia acts as a stimulus for the vergence, which will be produced in the proper direction to favor the haplopla. In the art there are known ways of measuring fusional vergences based on tests that are outside the scope of the present invention, such as the so-called Maddox Rod.
    In an advantageous embodiment, determining a measurement of a range of binocular vision for said user comprises:
    - determine a measurement of the user's foria, obtaining a value of prismatic diopters of foria;
    - determine a measurement of fusional vergences of the user, obtaining prismatic diopter values for blurry points, double vision points and recovery points for binocular vision.
    Thus, during the measurement, prisms of increasing powers are added until the vision becomes blurred, defining the blur point, it continues to be added until it passes to diplopia, defining the double vision point, and then they are withdrawn until the user Go back to binocular vision. In extreme cases, there may not be a blur point, but the user goes directly to the double vision point, in this case the latter will be used as equivalent to the blur point.
    In this way, binocular vision ranges are obtained for the second vision distance.
    Preferably, determining said diopter value for a compensation prism comprises determining said diopter value according to the following formula:
    P = (2F-Vc) / 3
    in which all values are expressed in prismatic diopters and:
    P is the compensation prism;
    F is the foria;
    Vc is the compensation vergence, defined by said blur point; in which a value of P equal to or less than 0 indicates that said compensation prism is not necessary and, therefore, this does not affect said horizontal design parameters.
    5
    10
    fifteen
    twenty
    25
    30
    What corresponds to the so-called Sheard Criteria for binocular vision, and is especially recommended in the case of exophoria. Thus, with this method a value of diopters necessary to maintain the binocular vision is obtained, given the measurement of the foria and the vergence of compensation, said compensation vergence being the necessary power that a prism must have that, as it increases Let the vision become blurred.
    In another alternative embodiment, said fusional verges comprise first fusional verges measured with nasal base prisms, and second fusional verges measured with temporal base prisms, so that a first compensation vergence corresponding to a first point of blurring measured with nasal base prisms, and a second compensation vergence corresponding to a second point of blurring measured with temporal base prisms; wherein determining said diopter value for a compensation prism comprises determining said diopter value according to the following formula:
    P = (Vmax-2Vmin) / 3
    in which all values are expressed in prismatic diopters and:
    P is the compensation prism;
    Vmax is the highest between said first compensation vergence and said second compensation vergence;
    Vmin is the lowest between said first compensation vergence and said second compensation vergence;
    in which a value of P equal to or less than 0 indicates that said compensation prism is not necessary and, therefore, this does not affect said horizontal design parameters.
    What corresponds to the so-called Percival Criteria for binocular vision and is especially indicated for endophoria.
    In binocular vision, the fovea of one eye corresponds to a small area centered on the fovea of the other eye called the Panum Area. Thus, a small area of the other eye corresponds to each point of the retina of one eye. Thus, if one eye is
    5
    10
    fifteen
    twenty
    25
    30
    The patient will not present diplopia while the image falls within the Panum Area.
    It is known as fixing disparity to the difference in alignment of the visual axes that allows sensory fusion. When the magnitude of the disparity of fixation is small, the object is projected within the fusional areas of Panum, while if the disparity of fixation is large we can face anomalous causes or visual problems in near vision.
    The deviation can occur in both one eye and both and can be physiological or the result of stress on binocular vision. It is known as foria associated with the power of the prism necessary to neutralize said fixing disparity. In this sense the measurements of fixation disparity and associated form are equivalent because one implies the other.
    In an advantageous embodiment, determining a measurement of a range of binocular vision for said user comprises determining a measurement of the associated foria, obtaining a value of prismatic diopters of the associated foria; and wherein determining said diopter value for a compensation prism comprises using said prismatic diopter value of the associated foria.
    In this way, binocular vision is evaluated under associated conditions of vision as opposed to what happens with methods based on vergencias and foria. It is known that vergence error in binocular conditions is often not the same as in monocular conditions. Therefore, there are situations in which a user can be symptomatic, but conventional foria and vergence analysis does not give a clear explanation of the causes of the user's symptoms. The associated disparity test or associated foria is also considered to tend to give less prism than other methods, so it is especially advantageous to minimize weight and / or simplify lens design.
    In an advantageous embodiment, the design process comprises the additional steps of:
    5
    10
    fifteen
    twenty
    25
    30
    - determining an initial aisle length for each lens of said pair of lenses;
    - determine a measurement of a range of vertical binocular vision for said user;
    - determining a diopter value for a vertical compensation prism capable of maintaining said vertical binocular vision range;
    - determining vertical design parameters for each lens, which comprise a design aisle length and vertical design diopters, depending on said initial aisle length and said diopter value for said vertical compensation prism;
    - designing each lens of said pair of lenses according to said vertical design parameters.
    Thus, the method equivalent to that of inset is used, but vertically instead of horizontal. While users can maintain a certain tolerance for horizontal binocular vision due, in large part, to the ability of convergence and divergence of the eyes. This adaptability is much lower in the vertical direction, so it is particularly important that the optical centers are adapted to the characteristics of the user.
    Preferably, determining said initial aisle length for each lens of said pair of lenses comprises the steps of:
    - determine a first height of a first initial optical center corresponding to said first viewing distance,
    - determine a second height of a second initial optical center corresponding to said second viewing distance,
    - determining said initial aisle length from the difference between said first height and said second height.
    Thus it is possible to determine the vertical distance between both vision zones and obtain the initial value of the length of the aisles for each lens.
    Preferably, determining said first height of said first initial optical center comprises the steps of:
    5
    10
    fifteen
    twenty
    25
    30
    - said user looks at a first point located at said first viewing distance and aligned vertically with the pupil of the eye;
    - determine a measurement of an inclination of the user's head with respect to the vertical when looking at said first point;
    - determining said first height in accordance with said head inclination, and said position of use of said lens.
    That is, the user looks at a point at eye level but the user is allowed to tilt his head. This results in the location of said first optical center adapting to the user's way of looking, resulting in better adapted lenses. The expert will not have problems in determining, using trigonometric rules, the position of the optical center on the lens as a function of the inclination of the head and the position of use of said lens. As an example, a calculation is made for conditions in which:
    - the user tilts his head forward at an angle A,
    - the lens is intended for a position of use whose pantoscopic and galbe angles are zero,
    - the distance between the eye and the lens is D.
    On the other hand, the lens has a geometric center defined as the central point where, when the user has a fully vertical head, it is aligned with the pupil. Under these conditions, the distance between the optical center and said center point, H, obeys the following formula:
    H = Dtan (A)
    Preferably, determining said second height of said second initial optical center comprises the steps of
    - said user looks at a second point located at said second viewing distance;
    - determine a measurement of the inclination of the user's pupil with respect to the user's head when looking at said second point;
    - determining said second height according to said inclination of the pupil, and said position of use of said lens.
    Equivalent to the case of the first vision distance Generally at a closer distance, the user tends to move the eyes down.
    5
    10
    fifteen
    twenty
    25
    30
    In an advantageous embodiment, determining a measurement of a range of vertical binocular vision for said user comprises determining a measurement of the vertical associated foria, obtaining a value of prismatic diopters of the associated vertical foria; and wherein determining said diopter value for a vertical compensation prism comprises using said prismatic diopter value of the associated vertical foria. Thus, the binocular vision criteria performed under association conditions are used, equivalent to the horizontal case.
    The visual system's ability to perceive, detect or identify objects with good lighting conditions is known as visual acuity. Thus, for a constant distance to the object, if a user sees a small print lately, he has more visual acuity than another who does not see it. The acuity may be different in each eye and there are methods known in the art to determine it. Here the reference value 1 will be used for a complete visual acuity considered as normal vision.
    In an advantageous embodiment, for said second viewing distance, said user has a dominant eye and a non-dominant eye, and in which a first lens of said pair of lenses is for said dominant eye and a second lens of said pair of lenses is for said non-dominant eye, the process comprising the additional steps of:
    - determining a first correction factor for said first lens;
    - determining a second correction factor for said second lens;
    - determining a new value of said design inset for said first lens by multiplying the previous value by said first correction factor; Y
    - determining a new value of said design inset for said second lens by multiplying the previous value by said second correction factor;
    This allows correcting the inset based on the presence of dominance. It is common for users to present a dominant eye on which they tend to focus more on vision, usually because it is the one with the greatest visual acuity. Since the position in which the user tends to place the objects for close distances may be more focused on the dominant eye, make a modification to said inset
    5
    10
    fifteen
    twenty
    25
    30
    taking into account this factor allows obtaining more precision in the location of the second optical center of each lens, resulting in a lens more adapted to said user. In case the user does not present a dominant eye, or if the presence of dominance cannot be determined by the usual techniques, inset correction is not performed.
    There are users who in some vision conditions present what is known as central vision suppression. For these conditions the brain discards the central part of one of the eyes, usually the least dominant.
    Preferably, when said user does not have central vision suppression for said second vision distance, said method comprises the additional steps of:
    - determine a measurement of the user's dominant hand;
    - determining a measurement of visual acuity for said dominant eye;
    - determine a measurement of visual acuity for said non-dominant eye;
    - determining a minimum acuity corresponding to the minimum value between said visual acuity for said dominant eye and said visual acuity for said non-dominant eye
    - in the case that said dominant eye is on the same side as said dominant hand:
    - if said minimum acuity is equal to or greater than 1, determine said first correction factor as 0.9 and said second correction factor as 1.1;
    - if said minimum acuity is equal to or less than 0.8, determine said first correction factor as 0.8 and said second correction factor as 1.2;
    - in the case that said dominant eye is on the opposite side of said dominant hand:
    if said minimum acuity is equal to or greater than 1, determine said first correction factor as 1 and said second correction factor as 1;
    5
    10
    fifteen
    twenty
    25
    30
    - if said minimum acuity is equal to or less than 0.8, determine said first correction factor as 0.9 and said second correction factor as 1.1;
    It has been determined experimentally that these values optimize inset modifications, and in particular it has been observed that there is usually a difference between the cases that the dominant hand is on the same side or not of the dominant eye, possibly due to the displacement necessary to place an object at the point of vision using that hand. The expert will understand that these are reference values and that for intermediate cases of visual acuity, you can select the closest value or use an intermediate value.
    Preferably, when said user has central vision suppression for said second vision distance, said method comprises the additional steps of:
    - the user looks at a second point located at said second viewing distance;
    - determine a measure of the alignment between said second point and the eyes of said user;
    - if said alignment corresponds to said dominant eye, determine said first correction factor as 0, and said second correction factor as 2;
    - if said alignment corresponds to the midpoint between the user's eyes, determine said first correction factor as 1, and said second correction factor as 1;
    - if said alignment corresponds to an intermediate point between the previous two, determine said first correction factor as a value in the range of 0 to 1, and said second correction factor as a value in the range of 1 to 2, depending on of the alignment, and so that the sum of both is 2;
    Thus, the user is made to look at a point, for example a tablet or a book, and it is observed in which position he places that point with respect to his eyes, if he centers it more in front of the dominant eye, at the midpoint between both eyes or at an intermediate point, this is known as visio-postural reflex. In general it is not usually
    5
    10
    fifteen
    twenty
    25
    30
    A very precise measurement is necessary. Consequently, this procedure adapts the final inset to the user's visio-postural reflex, which gives the lenses a more precise adaptation to it.
    Another aspect of the invention is a method of manufacturing a pair of progressive ophthalmic lenses of the type indicated at the beginning characterized in that it comprises:
    - a design stage in which a design procedure is performed according to the above description, and
    - a manufacturing stage of said progressive ophthalmic lenses, in accordance with the result of said design stage.
    Getting so! a pair of lenses with the characteristics and technical effects described above.
    Another aspect of the invention is a system for designing a pair of progressive ophthalmic lenses for a user of the type indicated at the beginning, characterized in that it comprises:
    - measuring means for determining an initial inset for each lens of said pair of lenses;
    - measuring means for determining a measurement of a range of binocular vision for said user;
    - calculation means for determining a diopter value for a compensation prism capable of maintaining said range of binocular vision;
    - Calculation means for determining horizontal design parameters for each lens (6, 7), which comprise a design inset and design diopters, depending on said initial inset and said diopter value for said compensation prism;
    - design means for designing each lens of said pair of lenses according to said horizontal design parameters.
    With the characteristics and technical effects equivalent to those described above.
    Preferably, the system also includes:
    - measuring means for determining an initial aisle length for each lens of said pair of lenses;
    5
    10
    fifteen
    twenty
    25
    30
    - measuring means for determining a measurement of a range of vertical binocular vision for said user;
    - calculation means for determining a diopter value for a vertical compensation prism capable of maintaining said vertical binocular vision range;
    - calculation means for determining vertical design parameters for each lens, comprising a design aisle length and vertical design diopters, depending on said initial aisle length and said diopter value for said vertical compensation prism;
    - design means for designing each lens of said pair of lenses according to said vertical design parameters.
    With the characteristics and technical effects equivalent to those described above.
    Preferably, at least one of said measuring means for determining an initial inset for each lens and said measuring means for determining an initial aisle length for each lens of said pair of lenses, comprise:
    - a measuring device configured to be carried by a user and to provide distance and inclination measurements;
    - image capture means, configured to capture and store images of said user wearing said measuring device;
    - support and alignment means, configured to support said measuring means, keeping them in a known position and alignment with respect to said measuring device; Y
    - informatic means to make measurements using said captured images.
    Ace! The system makes it possible to take pictures of the user in different phases of the design procedure. With the images as! taken and knowing the position and alignment between the device and the image capture means, it is possible to use computer means, whether automated or assisted by an operator, to perform measurements based on said images. Since the user is wearing the device, the measurements provided in said device appear in the images and act as a scale reference for measurements made on said devices.
    5
    10
    fifteen
    twenty
    25
    30
    images, that is, when wearing such a device, it is possible to obtain references of sizes, distances and inclinations.
    Preferably, said image capture means comprise a photographic camera provided with a lens and an optical sensor. This simplifies the replacement of components given the offer of this type of devices in the market.
    Preferably, said objective has a focal length close to the size of said optical sensor. Generally the optical sensors are rectangular. Thus, in this case the size refers to the maximum diagonal of the sensor. The use of this criterion minimizes the effect of leakage lines on the images, so that more accurate measurements can be obtained.
    Another aspect of the invention is a measuring device for the design of a pair of progressive ophthalmic lenses, of the type indicated at the beginning, characterized in that it comprises a horizontal U-shaped horizontal support, with a front part, a right side part and a left side part, said support provided with:
    - A fastening means, configured to fasten said device to a frame of glasses worn by the user;
    - A declinometer, provided on said right side part or said left side part, configured to measure the inclination of the user's head;
    - A horizontal measuring element, provided on said right side part or said left side part, configured to measure distances perpendicular to the axis of the user's head; Y
    - Length reference means, provided in said front part, suitable for establishing a longitudinal size reference when measurements are made.
    Thus, the device can be placed on the frame of a pair of glasses, held by said fastening means which, preferably, comprise tweezers. This makes it very versatile and adaptable to different users. Having a declinometer allows you to measure the inclination with respect to the vertical, at least in the forward-facing direction. The horizontal measuring element allows measurements of distances such as the distance between the eye and the lens. Finally, the reference means of
    5
    10
    fifteen
    twenty
    25
    30
    length offers a reference of size for the images taken, so that when analyzing these, the reference of longitudinal size that can be seen in the device can be used to determine the scale of the measurements. This is especially advantageous when analyzing images for measurements, since often only an apparent size of the elements contained in the image is observed and its actual size cannot be determined. Thus, it is not necessary to carry out direct physical measurements with the user and the interaction time with the user decreases, as well as the inconvenience caused by the procedure.
    Preferably, it also includes height reference means, provided in said front part, suitable for establishing a vertical size reference when measurements are made. What is especially advantageous in situations where the aspect ratio of the image pixels is unknown or when there is a vertical inclination for a head position in the front-back direction. When using a second reference, you can have different patterns adapted to the vertical and horizontal lines.
    Preferably, said horizontal measuring element comprises a horizontally movable measuring ruler, provided with distance marks. Which simplifies the taking of horizontal measures.
    Another aspect of the invention is a pair of progressive ophthalmic lenses of the type indicated at the beginning, designed by a design procedure described above, and with the advantages and technical effects equivalent to those already described. These types of lenses are especially advantageous for users with totally accommodative convergent strabismus, this being a type of strabismus that usually occurs in children. In these cases, when focusing the vision, one of the eyes moves and the binocular vision is lost. The way to treat these cases is usually with a minimum prescription of diopters in near vision that avoids this effect. Thus, a pair of progressive lenses such as those described here are particularly advantageous in being able to guarantee the best possible conditions of binocularity and allow both distant and near vision.
    5
    10
    fifteen
    twenty
    25
    30
    The invention also encompasses other detail features illustrated in the detailed description of a form of embodiment of the invention and in the accompanying figures.
    Brief description of the drawings
    The advantages and characteristics of the invention can be seen from the following description in which, without limitation with respect to the scope of the main revindication, preferred ways of carrying out the invention are mentioned by mentioning the figures.
    Fig. 1 shows a graphic representation of a user's eyes and visual axes associated with said eyes.
    Fig. 2 shows a graphic representation of the eyes of a user, of visual axes associated with said eyes for a distance of distant vision and a distance of near vision, in which the positions of use of the lenses are marked in front of the eyes.
    Fig. 3 shows a graphic representation of the eyes of a user, of visual axes associated with said eyes for a distance of distant vision and a distance of near vision, in which the positions of use of the lenses are marked in front of the eyes. The figure represents a case in which there is facial asymmetry and in which the lenses have a galbe angle.
    Fig. 4 shows a schematic front view and a side view of the measuring device according to the invention, at the moment in which it is in the position of use.
    Fig. 5 is a front view of the measuring device according to the invention.
    Fig. 6 is an overhead view of the measuring device according to the invention.
    5
    10
    fifteen
    twenty
    25
    30
    Figs. 7 and 8 are side detail views of the measuring device according to the invention.
    Fig. 9 is a schematic perspective view of an auxiliary instrument used in the invention.
    Detailed description of some embodiments of the invention
    In order to exemplify the concept of foria, Fig. 1 shows a scheme to represent the user's foria, with an inter-ocular axis 4 that passes through the centers of rotation 8, 9 of each eye, said axis perpendicular to the nasal bisector axis 5 that crosses the nasal center 3. For the sake of clarity, the figure is for a user without facial asymmetries. Given a focal point 101, the vision lines corresponding to orthoforla 102, endophoria 103 and exophoria 104 are shown here.
    In an exemplary embodiment illustrated in Fig. 2, the design method according to the invention determines a design set for each lens 6, 7 of the pair of lenses to be designed. In particular, the lenses will have a first vision zone corresponding to the user's preferential infinity, located at 5m or more, and a second vision zone for a near distance between 35 and 45cm.
    Each lens 6, 7 is intended to be placed in front of the corresponding eye 1, 2, although for this first example, the angles of galbe 301, 302 are zero. Nor are they considered asymmetric in this example. For simplicity, the user's dominant eye is considered to be the right eye 1, for which the right lens 6 is designed, although the person skilled in the art will understand that the opposite case is equivalent.
    An exemplary embodiment of the invention is described below, with special attention to the design procedure of a pair of progressive ophthalmic lenses. It is considered a first distance of distant vision and a second distance of near vision. For simplicity of the example the user does not present facial asymmetries. Thus, the right lens 6 will be designed to have a position of
    5
    10
    fifteen
    twenty
    25
    30
    use in front of the right eye 1 and present a first optical center 209 for far vision, and a second optical center 210 for near vision. Equivalently, the left lens 7 will be designed to have a position of use in front of the left eye 2 and present a first optical center 211 for far vision, and a second optical center 212 for near vision.
    First, the user is wearing a spectacle frame adapted to said user. The measuring device 400 is placed on the mount, holding it to the mount by means of a clamp 401 provided in said device 400. Using a horizontally movable measuring ruler 405 provided on the side portions 412, 413 of the device 400, the distance between the corneal apex and the lens 6, 7 of each eye 1,2, obtaining the distance of vertex 213 for each eye.
    As a distance to the center 214 of each eye 1,2, that is, the distance between the corneal apex and the center of rotation 8,9, a value of 12mm is used, since it is the value by agreement considering that the user is emetrope . The expert will know how to adapt this value by decreasing it in case of farsightedness or increasing it in case of myopia.
    The user is made to look at his position of preferential infinity, placing the focus point at a known distance located on the nasal bisector axis 5, and the inclination marked by the declinometer 402 provided in the device 400 is noted.
    Next, an auxiliary instrument 500 of which a schematic view is shown in Fig. 9 is used. This auxiliary instrument 500 comprising the support and alignment means 501 to which a chamber 502 and a chin guard 503 have been attached. As an exemplary embodiment, the support and alignment means 501 comprise a rigid rod 501 of about 60 cm in which the distances are marked. The camera 502 is anchored to one end of the wand 501 and at the other end a chin guard 503 is provided vertically, which can be placed under the user's nose or on his chin, if it is in the position under the nose it is annoying, so that it is comfortable as well as stable. For the example a camera 502 of the compact calls is used, since they have a low weight and allow a simplified design, with a set that is sufficiently light and
    5
    10
    fifteen
    twenty
    25
    30
    manageable. The camera in the example has a zoom lens, that is, it has a range of focal lengths. In the example, the focal length is set to a length equivalent to about 43mm for 24x36mm lenses (known as 35mm lenses). This is usually the scale shown by the current compact cameras. Other forms of realization use fixed auxiliary instruments 500 in which the camera 502 is supported by a support, for example a tripod, and the user is the one who places it in the use position of the auxiliary instrument 500. This second type of auxiliary instrument 500 It is more precise but requires sufficient space for its location, while the type of auxiliary instrument 500 described in the previous example has the advantage of taking up little space and being easily storable.
    At this point in the example procedure, the chin guard 503 of the auxiliary instrument 500 is placed under the nose of the user, with the auxiliary instrument 500 in a horizontal position, so that the camera 502 is aligned with the axis of vision and eyes , the user is asked to look at the infinity and a frontal photograph is taken, in which the user's eyes will appear facing the infinite, and the reference means of length 404 provided in the front part 411 of the device 400. Said photography is used to measure the DIP from a distance 201, that is, the one that corresponds to the first vision distance for the example. The reference means of length 404 are used as the scale of said measurement. Since there are no facial asymmetries, the naso-pupillary distance of each eye is the same, and it takes the value of half of the DIP by far 201.
    Additionally, the position where the user's pupils are located facing infinity is determined in the photograph. This information, together with the inclination data measured for preferential infinity, will be used to determine the ideal position of the first optical center 209 of the right lens 6, and the first optical center 210 of the left lens 7. The expert will understand that the Localization of the optical centers on the lenses 6, 7 is calculated by projecting the path to which the pupils look by means of usual trigonometric calculation tools, and the final value will therefore depend on the geometry of the lenses 6, 7 and their position of use. You get so! the horizontal and vertical positions of the first optical center 209, 211 of each lens 6, 7.
    5
    10
    fifteen
    twenty
    25
    30
    Next, the auxiliary instrument 500 is removed and the user is made to look at a reading board, allowing it to be placed in its preferential position, in this case for close distance. The measurement of the distance to the splint and the degrees of inclination of the head is taken, by means of the declinometer 402. In this example, the user tilts the head down, which is usually more usual.
    Then the auxiliary instrument 500 is placed back under the nose of the user. The user is asked to tilt the head up the same degrees of inclination as measured in the 402 declinometer in the previous step. The auxiliary instrument 500 is maintained in a horizontal position thanks to the chin guard 503 being foldable. A reference object is placed on the rod 501, at the distance previously measured for the splint. The user is asked to look at the object without moving his head and a picture is taken. Said photograph is used to measure the DIP of near 202, which for this example corresponds to the second viewing distance.
    Thus, since there are no asymmetries, the values of the pupillary path 216, 217 of each eye result in half the difference between the DIP of far 201 and the DIP of near 202. As an example, if the DIP of far 201 takes a value of 73mm and the DIP of near 202 takes a value of 69mm, the pupillary path 216, 217 in each eye will be 2mm. Then, each pupillary path 216, 217 is projected by trigonometrle, between the near vision point and the center of rotation 8, 9 of each eye, so that, at the point where this projection intersects with the lens, it is determined as the second optical center 210, 212 for near vision of each lens 6, 7. Equivalent to the first optical center 209, 211 for far vision, the point will depend on the position of use and geometry of the lens in question. In this way the horizontal and vertical positions of the second optical center 210, 212 of each lens are obtained, with which both the initial inset 203, 204 and the length of the initial aisle can be calculated. In the case of the inset, it corresponds to the horizontal distance between the first and the second optical center, and in the case of the corridor it corresponds to the vertical distance. Subsequently, the initial inset of each lens 6, 7 is corrected according to the Kappa angle, in the case of the example, subtracting a value of 0.35mm, which is the accepted value for emetropla. For example, an inset result of 2.7mm, give it a corrected inset
    5
    10
    fifteen
    twenty
    25
    30
    2.35mm, because the center of rotation 8, 9 of the eye and the optical center are not exactly in the same position.
    Finally it is determined if the user has a dominant eye, and is related to his dominant hand. For an example case, the user is right-handed and his dominant eye is the right eye 1. It is also observed by usual ophthalmological techniques, that the user has a normal vision with visual acuity 1 in each eye 1,2, and that does not present central suppression of near vision. Thus, the total inset is distributed at 45% in the right eye 1 and 55% in the left eye, multiplying by 0.9 the initial inset of the right eye 1, and by 1.1 the initial inset of the left eye 2.
    To determine the range of binocular vision and the value of diopters that would be needed to maintain said range of binocular vision in the case of horizontal direction, the foria and fusional vergences are examined. For this, the usual ophthalmology techniques are used, which are not detailed here since they are widely known to a person skilled in the art and have already been pointed out earlier in this document. In particular, a value of diopters of foria is obtained, and some values of prismatic diopters for the point of blur, which is the moment at which the user begins to see blurry. In the example, it is observed that the user presents an exophoria, that is, an outward trend. For this reason, the Sheard criterion is used, determining a compensation prism value according to the formula:
    P = (2F-Vc) / 3
    in which all values are expressed in prismatic diopters and:
    P is the compensation prism;
    F is the foria;
    Vc is the compensation vergence, defined by said blur point;
    In one example, the user presents 8 diopters of foria closely, and the vergence of compensation of 4 diopters prismatic. According to the previous formula, it is obtained that the user needs 4 diopters to maintain the range of binocular vision. In the example, the Prentice rule is not used to obtain a diopter difference by displacing the optical center, but it is decided to use a prism of 2 diopters in each eye, at 0 ° in
    5
    10
    fifteen
    twenty
    25
    30
    the right eye and 180 ° in the left eye, to obtain the 4 total diopters needed.
    In this way, horizontal design parameters are obtained that comprise the initial inset (corrected according to the criterion of the Kappa angle and the dominant eye), and the diopters for the compensation prism.
    An equivalent procedure is performed to measure the range of vertical binocular vision, obtaining that no correction is necessary. For the sake of simplicity, the procedure is not detailed since it is equivalent to the previous case. Thus, the vertical design parameters simply comprise the length of the aisles obtained above, since no vertical compensation prism is necessary.
    Finally, with the horizontal design parameters and the vertical design parameters obtained, the pair of ophthalmic lenses is designed and manufactured according to the design specifications, thus obtaining a pair of progressive lenses, adapted to the user.
    For the examples, the calculation means comprise a computer with a program configured for the optical calculation, for example, a calculation table. Likewise, the measurements made on the images are carried out on a computer that has an image processing program.
    In another exemplary embodiment, shown in Fig. 3, the lenses of the glasses have an angle of galbe 301, 302. Thus, the calculation of the position of the different optical centers 209, 210, 211, 212 must be in count these angles and, consequently, the insets too. Equivalently, if the lenses have a pantoscopic angle to the aisles. Fig. 3 also illustrates the example in which there is a small facial disymmetry and the nasal bisector axis 3 is not centered between both eyes 1, 2 but is slightly displaced towards the left eye 2.
    权利要求:
    Claims (27)
    [1]
    5
    10
    fifteen
    twenty
    25
    30
    1 Design procedure of a pair of progressive ophthalmic lenses (6, 7) for a user, intended to present at least a first zone with a first optical center (209, 211) for a first viewing distance, and a second zone with a second optical center (210, 212) for a second vision distance, said second vision distance being less than said first vision distance; wherein each lens (6, 7) of said pair of lenses is intended to have a position of use in front of a respective eye (1, 2) of said user, characterized in that it comprises the following steps:
    - determining an initial inset (203, 204) for each lens (6, 7) of said pair of lenses;
    - determine a measurement of a range of binocular vision for said user;
    - determine a diopter value for a compensation prism capable of maintaining said range of binocular vision;
    - determining horizontal design parameters for each lens (6, 7), which comprise a design inset and design diopters, depending on said initial inset (203, 204) and said diopter value for said compensation prism ;
    - designing each lens (6, 7) of said pair of lenses according to said horizontal design parameters.
    [2]
    2. Design procedure according to claim 1, characterized in that said first viewing distance is an optical infinity distance, or preferably, a preferential infinity distance; and said second distance is a working distance for near vision.
    [3]
    3.- Design procedure according to claim 1, characterized in that said first viewing distance is a working distance for medium distance; and said second distance is a working distance for near vision.
    5
    10
    fifteen
    twenty
    25
    30
    [4]
    4. - Design process according to any of claims 1 to 3,
    characterized in that determining said initial inset (203, 204) for each lens (6, 7) comprises determining an initial inset (203, 204) with a fixed value between 2.0 and 3.0 mm, more preferably 2, 5 mm
    [5]
    5. - Design process according to any of claims 1 to 3,
    characterized in that determining said initial inset (203, 204) for each lens (6, 7) comprises the following steps:
    - for each lens (6, 7):
    - determining a measurement of a vertex distance (213) between the corneal apex (205, 207) of the eye (1, 2) corresponding to said lens (6, 7) and the position of use of said lens (6, 7) ; Y
    - determining a value of a distance to the center (214) between said corneal apex (205, 207) of the eye (1, 2) and a center of rotation (8, 9) of the eye (1, 2);
    - determining a measurement of a first interpupillary distance (201) for said first viewing distance;
    - determining a measurement of a second interpupillary distance (202) for said second viewing distance;
    - determining a pupillary path value (216, 217) as half of the difference between said first interpupillary distance (201) and said second interpupillary distance (202); Y
    - determining the said initial inset value (203, 204) for each lens (6, 7) by projecting said pupillary path (216, 217), considering said distance between said center of rotation (8, 9) and the use position of said lens (6, 7).
    [6]
    6. - Design method according to any one of claims 1 to 3, characterized in that determining said initial inset for each lens (6, 7) comprises the following steps for each lens (6, 7) of said pair of lenses:
    - determining a measurement of a vertex distance (213) between the corneal apex (205, 207) of the eye (1, 2) corresponding to said lens (6, 7) and the position of use of said lens (6, 7) ;
    5
    10
    fifteen
    twenty
    25
    30
    - determining a value of a distance to the center (214) between said corneal apex (205, 207) of the eye (1,2) and a center of rotation (8, 9) of the eye (1, 2);
    - determining a measurement of a first naso-pupillary distance (304, 306) for said first viewing distance;
    - determining a measurement of a second naso-pupillary distance (305, 307) for said second vision distance;
    - determining a pupillary travel value (216, 217) as the difference between said first naso-pupillary distance (304, 306) and said second naso-pupillary distance (305, 307); Y
    - determining the said initial inset value (203, 204) for each lens (6, 7) by projecting said pupillary path (216, 217), considering said distance between said center of rotation (8, 9) and the position of use of said lens (6, 7).
    [7]
    7. - Design method according to any one of claims 1 to 6, characterized in that when said user looks at a point (101) located at said second viewing distance, each eye (1, 2) of said user has a Kappa angle , and wherein determining said initial inset for each lens (6, 7) comprises the additional steps of
    - determining a correction of said initial inset (203, 204) for each lens (6, 7) based on said Kappa angle of each eye (1, 2) corresponding to each lens
    (6, 7); Y
    - apply said correction to said initial inset.
    [8]
    8. - Design procedure according to revindication 7, characterized in that said correction of said initial inset comprises subtracting 0.35mm if said eye (1, 2) has emetropla, subtracting between 0.35mm and 0.7mm if said eye (1 , 2) has hypermetropla, or subtract between 0.15mm and 3.5mm if said eye (1,2) has myopia.
    [9]
    9. - Design method according to any of claims 1 to 8, characterized in that determining a measurement of a range of binocular vision for said user comprises:
    - determine a measurement of the user's foria, obtaining a value of prismatic diopters of foria;
    5
    10
    fifteen
    twenty
    25
    30
    - determine a measurement of fusional vergences of the user, obtaining prismatic diopter values for blurry points, double vision points and recovery points for binocular vision.
    [10]
    10. - Design method according to claim 9, characterized in that determining said diopter value for a compensation prism comprises determining said diopter value according to the following formula:
    P = (2F-Vc) / 3
    in which all values are expressed in prismatic diopters and:
    P is the compensation prism;
    F is the foria;
    Vc is the compensation vergence, defined by said blur point; in which a value of P equal to or less than 0 indicates that said compensation prism is not necessary and, therefore, this does not affect said horizontal design parameters.
    [11]
    11. - Design procedure according to claim 9, characterized in that said fusional verges comprise first fusional verges measured with nasal base prisms, and second fusional verges measured with temporary base prisms, so that a first vergence of compensation corresponding to a first point of blurring measured with nasal base prisms, and a second vergence of compensation corresponding to a second point of blurring measured with temporal base prisms; wherein determining said diopter value for a compensation prism comprises determining said diopter value according to the following formula:
    P = (Vmax-2Vmin) / 3
    in which all values are expressed in prismatic diopters and:
    P is the compensation prism;
    Vmax is the highest between said first compensation vergence and said second compensation vergence;
    Vmin is the lowest between said first compensation vergence and said second compensation vergence;
    5
    10
    fifteen
    twenty
    25
    30
    wherein a value of P equal to or less than 0 indicates that said compensation prism is not necessary and, therefore, this does not affect said horizontal design parameters.
    [12]
    12. - Design method according to any one of claims 1 to 8, characterized in that determining a measurement of a range of binocular vision for said user comprises determining a measurement of the associated form, obtaining a value of prismatic diopters of the associated form; and wherein determining said diopter value for a compensation prism comprises using said prismatic diopter value of the associated form.
    [13]
    13. - Method according to any of claims 1 to 12, characterized in that it comprises the additional steps of:
    - determining an initial aisle length for each lens (6, 7) of said pair of lenses;
    - determine a measurement of a range of vertical binocular vision for said user;
    - determining a diopter value for a vertical compensation prism capable of maintaining said vertical binocular vision range;
    - determining vertical design parameters for each lens (6, 7), comprising a design aisle length and vertical design diopters, depending on said initial aisle length and said diopter value for said vertical compensation prism ;
    - designing each lens (6, 7) of said pair of lenses according to said vertical design parameters.
    [14]
    14. - Design procedure according to revindication 13, characterized in that determining said initial aisle length for each lens (6, 7) of said pair of lenses comprises the steps of:
    - determining a first height of a first initial optical center (209, 211) corresponding to said first viewing distance,
    - determining a second height of a second initial optical center (210, 212) corresponding to said second viewing distance,
    5
    10
    fifteen
    twenty
    25
    30
    - determining said initial aisle length from the difference between said first height and said second height.
    [15]
    15. - Design procedure according to claim 14, characterized in that determining said first height of said first initial optical center (209, 211) comprises the steps of:
    - said user looks at a first point located at said first viewing distance and aligned vertically with the pupil of the eye (1,2);
    - determine a measurement of an inclination of the user's head with respect to the vertical when looking at said first point;
    - determining said first height in accordance with said head inclination, and said position of use of said lens (6, 7).
    [16]
    16. - Design method according to any of claims 14 or 15, characterized in that determining said second height of said initial second optical center (210, 212) comprises the steps of
    - said user looks at a second point (101) located at said second viewing distance;
    - determining a measurement of the inclination of the user's pupil with respect to the user's head when looking at said second point (101);
    - determining said second height according to said inclination of the pupil, and said position of use of said lens (6, 7).
    [17]
    17. - Design method according to any one of claims 13 to 16, characterized in that determining a measurement of a range of vertical binocular vision for said user comprises determining a measurement of the vertical associated foria, obtaining a value of prismatic diopters of the foria vertical associate; and wherein determining said diopter value for a vertical compensation prism comprises using said prismatic diopter value of the associated vertical foria.
    [18]
    18.- Design method according to any of claims 1 to 17, characterized in that, for said second viewing distance, said user has a dominant eye (1, 2) and a non-dominant eye (1, 2), and in the one that a first lens (6,
    5
    10
    fifteen
    twenty
    25
    30
    7) of said pair of lenses is for said dominant eye (1, 2) and a second lens (6, 7) of said pair of lenses is for said non-dominant eye (1, 2), the process comprising the additional steps of :
    - determining a first correction factor for said first lens (6, 7);
    - determining a second correction factor for said second lens (6, 7);
    - determining a new value of said design inset for said first lens (6, 7) by multiplying the previous value by said first correction factor; Y
    - determining a new value of said design inset for said second lens (6, 7) by multiplying the previous value by said second correction factor.
    [19]
    19.- Design procedure according to revindication 18, characterized in that said user does not have central vision suppression for said second vision distance and said procedure comprises the additional steps of:
    - determine a measurement of the user's dominant hand;
    - determining a measurement of visual acuity for said dominant eye (1, 2);
    - determining a measurement of visual acuity for said non-dominant eye (1, 2);
    - determining a minimum acuity corresponding to the minimum value between said visual acuity for said dominant eye (1, 2) and said visual acuity for said non-dominant eye (1,2)
    - in the case that said dominant eye (1, 2) is on the same side as said dominant hand:
    - if said minimum acuity is equal to or greater than 1, determine said first correction factor as 0.9 and said second correction factor as 1.1;
    - if said minimum acuity is equal to or less than 0.8, determine said first correction factor as 0.8 and said second correction factor as 1.2;
    - in the case that said dominant eye (1, 2) is on the opposite side of said dominant hand:
    5
    10
    fifteen
    twenty
    25
    30
    - if said minimum acuity is equal to or greater than 1, determine said first correction factor as 1 and said second correction factor as 1;
    - if said minimum acuity is equal to or less than 0.8, determine said first correction factor as 0.9 and said second correction factor as 1.1.
    [20]
    20. - Design procedure according to revindication 18, characterized in that said user has central vision suppression for said second vision distance and said procedure comprises the additional steps of:
    - the user looks at a second point (101) located at said second viewing distance;
    - determining a measure of the alignment between said second point (101) and the eyes (1, 2) of said user;
    - if said alignment corresponds to said dominant eye (1, 2), determine said first correction factor as 0, and said second correction factor as 2;
    - if said alignment corresponds to the midpoint between the eyes (1, 2) of the user, determine said first correction factor as 1, and said second correction factor as 1;
    - if said alignment corresponds to an intermediate point between the previous two, determine said first correction factor as a value in the range of 0 to 1, and said second correction factor as a value in the range of 1 to 2, depending on of the alignment, and so that the sum of both is 2.
    [21]
    21. - Procedure for manufacturing a pair of progressive ophthalmic lenses (6, 7), characterized in that it comprises:
    - a design step in which a design process is performed according to any one of claims 1 to 20; Y
    - a manufacturing stage of said progressive ophthalmic lenses (6, 7), in accordance with the result of said design stage.
    5
    10
    fifteen
    twenty
    25
    30
    [22]
    22. - System for designing a pair of progressive ophthalmic lenses (6, 7) for a user, characterized in that it comprises:
    - measuring means for determining an initial inset for each lens (6, 7) of said pair of lenses;
    - measuring means for determining a measurement of a range of binocular vision for said user;
    - calculation means for determining a diopter value for a compensation prism capable of maintaining said range of binocular vision;
    - calculation means for determining horizontal design parameters for each lens (6, 7), comprising a design inset and design diopters, depending on said initial inset and said diopter value for said compensation prism;
    - design means for designing each lens (6, 7) of said pair of lenses according to said horizontal design parameters.
    [23]
    23. - System according to claim 22, characterized in that it also comprises:
    - measuring means for determining an initial aisle length for each lens (6, 7) of said pair of lenses;
    - measuring means for determining a measurement of a range of vertical binocular vision for said user;
    - calculation means for determining a diopter value for a vertical compensation prism capable of maintaining said vertical binocular vision range;
    - calculation means for determining vertical design parameters for each lens (6, 7), which comprise a design aisle length and vertical design diopters, depending on said initial aisle length and said diopter value for said vertical compensation prism;
    - design means for designing each lens (6, 7) of said pair of lenses according to said vertical design parameters.
    [24]
    24. - System according to claim 22, characterized in that at least one of said measuring means for determining an initial inset for each lens (6, 7) and
    5
    10
    fifteen
    twenty
    25
    30
    said measuring means for determining an initial aisle length for each lens (6, 7) of said pair of lenses, comprise:
    - a measuring device (400) configured to be carried by a user and to provide distance and inclination measurements;
    - image capture means (502), configured to capture and store images of said user wearing said measuring device (400);
    - support and alignment means (501), configured to support said measuring means, keeping them in a known position and alignment with respect to said measuring device (400); Y
    - informatic means to make measurements using said captured images.
    [25]
    25. - System according to claim 24, characterized in that said image capture means (502) comprise a photographic camera provided with an objective and an optical sensor.
    [26]
    26. - System according to claim 25, characterized in that said objective has a focal length close to the size of said optical sensor.
    [27]
    27. - Measuring device (400) for the design of a pair of progressive ophthalmic lenses (6, 7) (6, 7), characterized in that it comprises a horizontal U-shaped support (410), with a front part (411), a right side part (412) and a left side part (413), said support (410) provided with:
    - Fastening means (401), configured to fasten said device (400) to a frame of glasses worn by the user;
    - A declinometer (402), provided on said right side part (412) or said left side part (413), configured to measure the inclination of the user's head;
    - A horizontal measuring element (403), provided on said right side part (412) or said left side part (413), configured to measure distances perpendicular to the axis of the user's head; Y
    - Length reference means (404), provided in said front part (411), suitable for establishing a longitudinal size reference when measurements are made.
    5 28.- Measuring device (400) according to claim 27, characterized in that
    It also includes height reference means, provided in said front part (411), suitable for establishing a vertical size reference when measurements are made.
    10 29.- Measuring device (400) according to any of claims 27 or 28,
    characterized in that said horizontal measuring element (403) comprises a horizontally movable measurement ruler (405), provided with distance marks (406).
    15 30.- Pair of progressive ophthalmic lenses (6, 7), designed by a procedure
    of design according to any of claims 1 to 20.
    类似技术:
    公开号 | 公开日 | 专利标题
    US7338159B2|2008-03-04|Adjustable focus lenses
    EP0300384B1|1994-02-16|Optical device for precision work
    JP2011209530A|2011-10-20|Wearing condition parameter measurement device for spectacle lens and wearing condition parameter measurement method for spectacle lens
    JP6556133B2|2019-08-07|Apparatus and method for measuring subjective refractive power
    ES2556653T3|2016-01-19|Device that allows the necessary measurements for the assembly of the crystals and for the adjustment of the frames of prescription glasses
    BRPI0620000A2|2011-12-06|method for determining an ophthalmic lens
    KR102053389B1|2019-12-06|Device and method for determining at least one objective eye refraction parameter of a subject depending on a plurality of gaze directions
    EP1069878A1|2001-01-24|Decentered protective eyewear
    US9740024B2|2017-08-22|Pair of progressive ophthamlic lenses
    US9759931B2|2017-09-12|Pair of progressive ophthalmic lenses
    ES2241013T3|2005-10-16|LENS OF MULTIFOCAL GLASSES.
    ES2823651T3|2021-05-07|Adjusting a light-dependent spectacle lens
    US8857990B2|2014-10-14|Device and process for progressive addition lens design
    ES2856188T3|2021-09-27|Simultaneous Vision Simulator Miniaturized Instrument
    ES2631478B1|2018-07-04|Procedure, system and measuring device for the design of a pair of progressive ophthalmic lenses, manufacturing procedure and corresponding lenses.
    ES2346175B1|2011-09-30|INSTRUMENT FOR THE SIMULATION OF MULTIFOCAL OPHTHALM CORRECTIONS.
    JP2020515918A|2020-05-28|Method for designing a pair of spectacle lenses and device for optical measurement
    KR102294822B1|2021-08-26|Eyeglasses manufacturing body data measuring device using stereo vision
    ES2789583T3|2020-10-26|Method and apparatus for determining the reference posture of the head of a subject
    JP2021156978A|2021-10-07|glasses
    KR101894155B1|2018-08-31|Self-adjusting glasses system
    WO2006102365A2|2006-09-28|Adjustable focus lenses
    KR20190057871A|2019-05-29|Virtual reality device for preventing myopic progression
    WO2017124111A1|2017-07-20|Lens engagement system and method
    BR112014033110B1|2021-10-19|DEVICE AND PROCESS FOR MEASUREMENT OF OBJECTIVE EYE REFRACTION AND AT LEAST ONE GEOMETRIC-MORPHOLOGICAL PARAMETER OF AN INDIVIDUAL
    同族专利:
    公开号 | 公开日
    ES2631478B1|2018-07-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2010034727A1|2008-09-24|2010-04-01|Essilor International |Method for determining the inset of a progressive addition lens|
    JP2013250459A|2012-06-01|2013-12-12|Tokai Kogaku Kk|Analyzing method, processing method, and analyzing program for spectacle lens|
    JP2014077816A|2012-10-08|2014-05-01|Tokai Kogaku Kk|Design method for progressive refractive power lens|
    ES2556263A1|2014-07-09|2016-01-14|Joseba GORROTXATEGI SALABERRIA|Procedure, system, computer system and computer program product to design at least one progressive ophthalmic lens, and progressive ophthalmic lens |EP3167335A1|2014-07-09|2017-05-17|Optometric Air Lens. S.L.|Progressive ophthalmic lenses|
    法律状态:
    2018-07-04| FG2A| Definitive protection|Ref document number: 2631478 Country of ref document: ES Kind code of ref document: B1 Effective date: 20180704 |
    2021-10-04| FD2A| Announcement of lapse in spain|Effective date: 20211004 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201631430A|ES2631478B1|2016-11-10|2016-11-10|Procedure, system and measuring device for the design of a pair of progressive ophthalmic lenses, manufacturing procedure and corresponding lenses.|ES201631430A| ES2631478B1|2016-11-10|2016-11-10|Procedure, system and measuring device for the design of a pair of progressive ophthalmic lenses, manufacturing procedure and corresponding lenses.|
    [返回顶部]