WO2014128744A1 - Ensemble de lentilles de contact pour presbytie et procédé de sélection des lentilles de contact pour presbytie - Google Patents

Ensemble de lentilles de contact pour presbytie et procédé de sélection des lentilles de contact pour presbytie Download PDF

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Publication number
WO2014128744A1
WO2014128744A1 PCT/JP2013/000899 JP2013000899W WO2014128744A1 WO 2014128744 A1 WO2014128744 A1 WO 2014128744A1 JP 2013000899 W JP2013000899 W JP 2013000899W WO 2014128744 A1 WO2014128744 A1 WO 2014128744A1
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Prior art keywords
presbyopia
contact lens
lens
type
power
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PCT/JP2013/000899
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English (en)
Japanese (ja)
Inventor
山口　博之
後藤　裕二
幸久 阪井
賢一 石原
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株式会社メニコン
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Priority to PCT/JP2013/000899 priority Critical patent/WO2014128744A1/fr
Priority to JP2013557973A priority patent/JP5525114B1/ja
Publication of WO2014128744A1 publication Critical patent/WO2014128744A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G02C7/044—Annular configuration, e.g. pupil tuned

Definitions

  • the present invention relates to a related art of a presbyopic contact lens that can compensate for a decreased ability to adjust visual acuity while maintaining a good quality of view (QOV) in presbyopic eyes.
  • the present invention relates to a presbyopic contact lens set obtained by combining such presbyopic contact lenses so that they can be selectively applied based on predetermined selection criterion information, and a method for selecting a plurality of types of presbyopia contact lenses.
  • contact lenses for presbyopia that are applied to presbyopic eyes and compensate for the decreased ability to adjust visual acuity are known.
  • the contact lens for presbyopia is provided with a plurality of regions in which different lens powers are set in the optical region of one contact lens. That is, the optical region of the presbyopia contact lens is provided with a near-use region in which an appropriate lens power is set for near-field observation, and a far-field region in which an appropriate lens power is set for distance-viewing, Furthermore, there are some provided with an intermediate region or a transition region in which the lens power adjusted for observation of the intermediate distance is set as necessary.
  • the near vision area and the distance vision area are selectively or simultaneously used to perform vision correction according to a required distance.
  • Japanese Patent Application Laid-Open No. 63-95415 Patent Document 1
  • Japanese Patent Application Laid-Open No. 1-319729 Patent Document 2
  • U.S. Pat. No. 4,693,572 Patent Document 3
  • Patent Document 4 Japanese Patent Application Laid-Open No. 59-208524
  • Patent Document 5 Japanese Patent Application Laid-Open No. Hei 2-217818
  • the conventional presbyopia contact lens is a bifocal lens in which a constant lens power is set for both the near vision region and the far vision region. It was a type.
  • a progressive type (progressive multifocal type) presbyopia contact lens in which a lens power that changes in a stepless manner is set in at least one of the near field and the far field has been provided.
  • Such a progressive type presbyopia contact lens can optically focus on a continuously changing viewing distance, so that the ability to adjust the visual acuity of the eye optical system can be supplemented steplessly.
  • Product description is made. Therefore, users of presbyopic contact lenses and prescribers are also expecting progressive type elderly with the expectation that objects will be in focus continuously and objects at any distance will be visible even if the viewing distance changes. Increasingly, visual contact lenses are selected.
  • the present inventor paid attention to the difference in appearance between both progressive and bifocal type presbyopia contact lenses, and compared the actual appearance by having both types worn by the user. We asked them to select and provide the type that looked good for the user.
  • both progressive type contact lenses and bifocal type contact lenses for presbyopia have various materials, surface shapes, sizes (DIA), lens thicknesses, It is only provided as an independent product with a lens power range. Therefore, there are many options for one type of presbyopic contact lens alone, but when considering combining two types of presbyopic contact lenses, it is cumbersome to choose which product should be used in combination. Met.
  • both types of presbyopia contacts can be used to compare and check progressive type contact lenses and bifocal type presbyopia contact lenses in response to different vision adjustment capabilities for each user. It is necessary to always provide all the lens powers for the lens. Therefore, prescribers and sellers of presbyopic contact lenses need to manage and stock a large number of presbyopic contact lenses at all times, which is cumbersome and increases labor and space. Is inevitable.
  • JP-A-63-95415 Japanese Unexamined Patent Publication No. 1-319729 US Pat. No. 4,693,572 JP 59-208524 A JP-A-2-217818
  • the present invention has been made against the background of the above-mentioned circumstances, and the solution to the problem is to efficiently provide a contact lens for presbyopia suitable for each user. It is an object of the present invention to provide a presbyopia contact lens set and a method for selecting a presbyopia contact lens.
  • adopted in each aspect as described below is employable by arbitrary combinations as much as possible.
  • the near-field area where the near-lens power is set and the far-field area where the distance-lens power is set are provided as areas of a predetermined size with the lens power constant, respectively.
  • the progressive type presbyopia contact lens is configured by combining a plurality of types with different set lens powers in the near-distance area and the far-distance area, respectively.
  • Bifocal type presbyopia contact lens and progressive based on selection criteria information including target distance and accommodation ability remaining in wearing eye
  • the presbyopia correction contact lens set and is provided type presbyopia correction contact lens is selected and characterized.
  • the present invention has been completed based on the results of many studies and experiments conducted by the inventor on the optical characteristics of bifocal type and progressive type and how they are seen during wearing.
  • the selection criteria information including the visual recognition target distance assumed in the above and the adjustment ability remaining in the wearing eye.
  • the bifocal type is used for each user based on selection criterion information including the visual recognition distance assumed in near vision and the adjustment ability remaining in the wearing eye.
  • progressive types can be selectively proposed. That is, in consideration of the conditions for each user, a type of presbyopia contact lens that will provide a good appearance can be selected based on objective information provided in advance. Therefore, it is possible to effectively prevent variations caused by user's subjective judgment and prescriber's experience difference, etc., and to provide a type of presbyopia contact lens suitable for users with excellent security and reliability. It becomes possible to propose efficiently.
  • the contact lens set for presbyopia it is provided to the market as a set in which a bifocal type and a progressive type are combined, and is provided to prescribers and sellers. It is also possible to provide both types of presbyopia contact lenses with the same or similar shapes, DIA, thickness, etc., in advance. As a result, even when comparing both types of presbyopia contact lenses during prescription, it is more efficient than selecting from a wide variety of products offered to the market as in the past. The comparison target can be specified.
  • the two types can be appropriately designed with uniformity as a set that is combined in advance as described above.
  • the contact lens set for presbyopia according to the invention, not only the prescriber's lens selection work is facilitated, but also it is possible to reduce a sense of discomfort such as wearing feeling in the user.
  • a second aspect of the present invention is a contact lens set for presbyopia according to the first aspect, and is based on the viewing target distance assumed in near vision and the adjustment ability remaining in the wearing eye, It comprises a selection criterion information body for providing the selection criterion information for selecting either a bifocal type presbyopia contact lens or the progressive type presbyopia contact lens.
  • the knowledge and experience of the prescriber can be more effectively provided by providing a selection criterion information body that provides information as a selection criterion between the bifocal type and the progressive type.
  • a selection criterion information body may be, for example, a storage element or a distribution signal storing electronic information in addition to a booklet or pamphlet that represents the selection criterion information using mathematical formulas, graphs, tables, or the like.
  • the present inventor can provide a presbyopia contact lens suitable for each user by making it possible to select a bifocal type or a progressive type based on many experiments and examinations.
  • the knowledge that it will be possible to select both types efficiently by obtaining knowledge and using information based on the visual recognition distance assumed in near vision and the adjustment ability remaining in the wearing eye as a selection criterion Obtained.
  • selection criteria are significant information for type selection that can be theoretically supported by objective optical property data described in the embodiments described later, but are assumed in near vision. It is not limited how to evaluate the visual recognition target distance and the adjustment ability remaining in the wearing eye to be a specific selection criterion.
  • a threshold or the like uniquely selected by the prescriber based on the visual recognition distance assumed in near vision and the adjustment ability remaining in the wearing eye.
  • the third and fourth aspects of the present invention described below can be suitably employed in the presbyopia contact lens set according to the first or second aspect, and can be used for near vision.
  • the selection criterion information based on the target distance and the adjustment ability remaining in the wearing eye is illustrated more specifically.
  • the third aspect of the present invention provides a lens required for far vision, wherein the selection criterion information is obtained based on a viewing target distance assumed in near vision and an adjustment ability remaining in the wearing eye.
  • a threshold value for selecting the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens for the additional power required for near vision in the eye optical system corrected by the power, and the threshold value The progressive type presbyopia contact lens is selected when the additional power required for near vision is small with respect to the threshold, while the additional power required for near vision with respect to the threshold is When the size is large, the information is such that the bifocal type contact lens for presbyopia is selected.
  • the “threshold value” in this aspect may be one threshold value indicating a boundary value as a selection category of both types of contact lenses.
  • two threshold values are set: a first threshold value for selecting a bifocal type presbyopic contact lens and a second threshold value for selecting a progressive type presbyopic contact lens. Between the two thresholds, any type can be arbitrarily selected in consideration of the user's preference and various conditions.
  • the visual recognition target distance assumed for near vision can be clearly seen.
  • the necessary addition power is used, and when the addition power is not required, the progressive type presbyopia contact lens is selected.
  • the selection criteria for both types of presbyopia contact lenses can be realized more easily and easily.
  • the additional power is small, such as 1D (diopter) or less, 0.5D or less, a progressive type presbyopia contact lens may be applied. In such an added power region, it is possible to select and deal with it individually in consideration of the user's preference and use conditions.
  • the contact lens set for presbyopia it is also possible to adopt a configuration according to the following fifth and sixth aspects as selection criterion information, thereby enabling the use of both types of contact lenses for presbyopia.
  • the selection criteria are further simplified, and the utilization of the present invention is more efficient and easy.
  • a fifth aspect of the present invention is the presbyopia contact lens set according to any one of the first to fourth aspects, wherein the near-field lens power is used for the distance lens power in the selection criterion information.
  • the additional power added to the lens power is less than 2.0D, the progressive-type contact lens for presbyopia is selected.
  • a presbyopic contact lens set according to any one of the first to fifth aspects, wherein in the selection criterion information, the near-use lens is used for the distance lens power.
  • a bifocal type contact lens for presbyopia is selected when the additional power added to the lens power is at least 2.0D or more.
  • the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens are configured by the same lens type among the soft contact lens, the hard contact lens, and the two-type contact lens.
  • both the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens used in combination as a presbyopia contact lens set are the same lens type. Accordingly, even when any type is selected and worn, a feeling of wearing that is not greatly different can be obtained. Therefore, for example, users who have used soft contact lenses as myopia contact lenses have come to use progressive-type presbyopia contact lenses, and further, bifocal-type presbyopia as the ability to adjust vision decreases. Even when it is assumed that a contact lens for use will be used, it is possible to continue to use the type of soft contact lens that has been used for a long time, and it is possible to make a transition without a great sense of incongruity. This is the same in both hard contact lenses and two-material contact lenses.
  • any kind of contact lens can be used for any kind of material.
  • soft contact lenses include HEMA (hydroxyethyl methacrylate), N-VP (N-vinylpyrrolidone), DMAA (dimethylacrylamide), amino acids.
  • a material such as a biocompatible material such as a copolymer can be used, and a soft contact lens made of a silicone hydrogel material including silicone can be used.
  • a material such as MMA (methyl methacrylate) or SMA (siloxanyl alkyl methacrylate) can be used as the hard contact lens.
  • the optical region is a hard material and the outer peripheral portion is formed.
  • a composite material as a soft material may be employed.
  • the eighth aspect of the present invention is the presbyopia contact lens according to the seventh aspect, wherein the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens are the same material. It is what is said.
  • a contact lens set for presbyopia combining both types in addition to the type of lens is provided.
  • a progressive type contact lens for presbyopia Even if the user uses a bifocal type contact lens for presbyopia with a decrease in the ability to adjust visual acuity, the user can make a better transition without feeling uncomfortable.
  • the contact lens for presbyopia of the bifocal type and the contact lens for presbyopia of the progressive type are provided. Both are configured by the same type of the simultaneous vision type and the alternate vision type.
  • contact lenses for presbyopia there are two types of contact lenses for presbyopia: simultaneous vision using image selection by the brain and alternating vision using movement of the visual axis. It is said.
  • a combination of a bifocal type presbyopia contact lens and a progressive type presbyopia contact lens composed of the same type of simultaneous vision type and alternate vision type is used. Since a contact lens set is provided, for example, even if a user of a progressive type presbyopic contact lens comes to use a bifocal type presbyopic contact lens as the ability to adjust vision decreases, A gentle transition is possible without changing the visual operation method.
  • either a refractive lens structure or a diffractive lens structure can be adopted as a lens structure for setting the lens power in the optical region.
  • a refractive lens structure or a diffractive lens structure can be adopted as a lens structure for setting the lens power in the optical region.
  • it is easy to design a diffraction grating that gives a target lens power and it is easy to adopt a diffractive lens structure.
  • the diffractive lens structure there is an advantage that the target optical characteristics can be realized with a thin lens thickness as compared with the refractive lens structure.
  • the bifocal type presbyopia contact lens and the progressive type contact lens for presbyopia are provided.
  • an intermediate region in which an intermediate lens power between the near lens power and the far lens power is set is provided.
  • the appearance of the region at the intermediate distance between the near and far can be improved by the optical characteristics of the intermediate region.
  • the intermediate area can be set with an intermediate lens power having a constant size different from both the near lens power and the distance lens power, but the near lens power and the distance lens can be set. It is also possible to set with an intermediate lens power that changes gradually or stepwise from at least one of the powers.
  • a lens power that continuously changes from a near-field area or a far-field area having a gradually changing lens power distribution is integrated with the near-field area or the far-field area. It is also possible to provide an intermediate area.
  • the contact for presbyopia according to the following eleventh and twelfth aspects is used.
  • a lens can also be used. That is, the eleventh aspect of the present invention is the presbyopia contact lens set according to any one of the first to tenth aspects, wherein the bifocal type presbyopia contact lens and the progressive type presbyopia are used. At least one of the contact lenses is a decenter lens.
  • the twelfth aspect of the present invention is the presbyopia contact lens set according to any one of the first to eleventh aspects, wherein the bifocal type presbyopia contact lens and the progressive type presbyopia. At least one of the contact lenses is a toric lens.
  • the feature of the present invention relating to the method for selecting a presbyopic contact lens is that the near lens power is based on selection criteria information based on the distance to be viewed required for near vision and the adjustment ability remaining in the wearing eye.
  • a bifocal-type presbyopia contact lens in which the set near vision area and the distance vision area in which the distance lens power is set are each provided as a predetermined size area with a constant lens power, and a near vision lens
  • a near vision lens Either a progressive-type presbyopia contact lens provided as a lens power distribution region in which at least one of the near-field region set with the power and the far-field region set with the distance lens power is gradually changed Is a method for selecting a presbyopic contact lens.
  • a presbyopic contact lens that can realize a good appearance adapted to each user, either a bifocal type or a progressive type is provided in advance as a specific selection. It becomes possible to select easily and efficiently based on the reference information. Therefore, variations caused by subjective judgments of users and differences in experience among prescribers are effectively prevented, and a type of contact lens for presbyopia that is suitable for users with excellent security and reliability. Can be proposed.
  • the progressive type presbyopia contact lens is selected when the distance to be viewed that is assumed in near vision can be clearly seen in the state corrected with the distance lens power. It is effective to select the bifocal type contact lens for presbyopia when it is difficult to visually recognize the distance to be visually recognized.
  • the selection of the bifocal type and the progressive type can be performed more efficiently and effectively according to each user.
  • suitable candidates for presbyopia contact lenses are preliminarily narrowed based on objective selection criteria information acquired for each user. I can do it. Therefore, it is possible to greatly reduce the labor and time spent by the user, prescriber, etc. in selecting the optimal presbyopia contact lens.
  • the graph showing MTF in the bifocal type presbyopia contact lens which has the lens power distribution shown by FIG. The graph showing MTF in the progressive type presbyopia contact lens which has the lens power distribution shown by FIG.
  • the graph showing MTF in the contact lens for myopia as a comparative example which has the lens power distribution shown by FIG. The graph showing the lens power distribution which is a setting aspect of the optical characteristic as 2nd embodiment in the contact lens of prefocal type shown in Fig.2 (a).
  • the graph showing MTF in the bifocal type presbyopia contact lens which has the lens power distribution shown by FIG. The graph showing MTF in the progressive type presbyopia contact lens which has the lens power distribution shown by FIG.
  • (A) is a graph showing an example of the power distribution of the bifocal type contact lens for presbyopia
  • (b) is a principal part enlarged view of (a).
  • the graph showing an example of the frequency distribution of the progressive type presbyopia contact lens.
  • FIG. 1 shows a contact lens set 10 for presbyopia as a first embodiment of the present invention.
  • the presbyopia contact lens set 10 includes a bifocal type presbyopia contact lens 12 and a progressive type presbyopia contact lens 14 with different lens powers set for the lenses 12 and 14. A combination of multiple types is included. Further, among the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 in which those having a plurality of types of optical characteristics are combined, an appropriate type of presbyopia is used for each user.
  • the presbyopia contact lens set 10 of this embodiment is configured by further combining selection criterion information bodies 15 that provide selection criterion information for selecting a viewing contact lens.
  • both types of contact lenses 12 and 14 basically have a lens front surface having a concave substantially spherical crown shape and a lens rear surface having a convex substantially spherical crown shape at the edge portion 16 at the outer peripheral edge of the lens.
  • the outer surface is connected smoothly.
  • An optical portion 18 having optical characteristics for correcting visual acuity is provided at a central portion of each contact lens 12, 14 at a predetermined diameter, while the inside of the edge portion 16 extends from the outer peripheral end of the optical portion 18.
  • An annular peripheral portion 20 having no optical characteristics is provided between the peripheral ends.
  • any type of contact lens can be used for any type of contact lens.
  • soft contact lenses include HEMA (hydroxyethyl methacrylate), N-VP (N-vinylpyrrolidone), and DMAA (dimethylacrylamide).
  • materials such as biocompatible materials such as amino acid copolymers, soft contact lenses made of silicone hydrogel materials including silicone can also be used.
  • materials such as MMA (methyl methacrylate) and SMA (siloxanyl alkyl methacrylate) can be adopted as the hard contact lens.
  • the presbyopia contact lenses 12 and 14 can also be a two-material contact lens having both soft type and hard type characteristics.
  • the optical part 18 is formed of a hard type material and the peripheral part 20 is soft.
  • a composite material formed from a type of material may also be employed.
  • a bifocal type presbyopia contact lens 12 and a progressive type presbyopia contact lens 14 each having a plurality of types of lens powers, which are combined as a set to form one presbyopia contact lens set 10. These are preferably unified into any one of a soft type lens, a hard type lens, and a two-type contact lens.
  • each of the plural types of bifocal type presbyopia contact lenses 12 and progressive type presbyopia contact lenses 14 constituting the presbyopia contact lens set 10 is a soft type. The material is substantially the same.
  • the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 are of the simultaneous vision type. Specifically, as shown in FIGS. 2A and 2B, a substantially circular first correction region 22 is formed in the central portion of the optical unit 18, and A substantially circular second correction region 24 is formed on the outer peripheral portion. Then, under the wearing state of the presbyopic contact lens 12 (14), the light beams transmitted through the first correction region 22 and the second correction region 24 which are formed concentrically and have different lens powers are simultaneously transmitted. The light is incident on the retina, and a clear image located near or far can be visually recognized by a selective action by the user's brain.
  • both the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 have the first correction region 22 as the near region and the second region.
  • the correction area 24 is a distance area. That is, in the bifocal type contact lens 12 for presbyopia, the lens power required for near vision is set in the first correction region 22 with a constant diopter value, but is required for far vision. The lens power is set in the second correction area 24 with a constant diopter value. Further, in the progressive type presbyopia contact lens 14, the lens power required for near vision is set in the first correction region 22 with a diopter value that gradually changes from the center of the optical part toward the radially outward direction. On the other hand, the lens power required for far vision is set in the second correction region 22 with a constant diopter value.
  • FIG. 1 a specific example of the lens power set in the optical unit 18 of the bifocal type contact lens 12 for presbyopia is shown in FIG.
  • the lens power required for far vision is ⁇ 4.0D
  • three types of additional power required for near vision are + 0.50D, + 1.5D, and + 2.5D.
  • the optical characteristics are exemplified.
  • the set lens power of the second correction area 24, which is the distance area is constant at ⁇ 4.0D.
  • a constant lens having a set lens power of the first correction area 22 which is a near-use area having a value different from ⁇ 3.5D, ⁇ 2.5D, and ⁇ 1.5D depending on the value of the additional power. Set to frequency.
  • FIG. 3 a specific example of the lens power set in the optical unit 18 of the progressive type presbyopia contact lens 14 is shown in FIG.
  • the additional powers required for near vision are + 0.50D, + 1.5D, +2.
  • the set lens power of the second correction area 24, which is the distance area is constant at ⁇ 4.0D.
  • the set lens power of the first correction area 22 which is a near-use area has a value different from ⁇ 3.5D, ⁇ 2.5D, and ⁇ 1.5D depending on the value of the additional power.
  • the added power gradually decreases toward the outside in the radial direction.
  • the set lens power of the first correction region 22 is the second correction at the outer peripheral edge of the first correction region 22 that is a connection point with the second correction region 24. It is changed until it reaches ⁇ 4.0D which is the set lens power in the region 24.
  • a transition area 26 may be provided as an intermediate area in which an intermediate lens power between the near lens power and the far lens power is set.
  • a transition region 26 may be provided that indicates a change in lens power in the radial direction that continuously connects the near lens power and the far lens power.
  • the lens power that is continuously connected and changed from the first correction region 22 in design is given.
  • a predetermined area on the outer peripheral edge of the first correction area 22, which is designed as a part of the correction area 22 of the first lens and has a lens power extremely close to the distance lens power, is used as a near lens power and a distance lens. It can be grasped as a transition region 26 indicating a change in the lens power in the radial direction that continuously connects the power.
  • the transition area 26 of the progressive type presbyopia contact lens 14 can be grasped as a setting area of 1/5 or less of the additional power, for example.
  • the transition region 26 can be considered as a lens power region that hardly functions optically for both near vision and far vision, in the contact lenses 12 and 14 for presbyopia of the present invention. Not required. That is, in the bifocal type presbyopia contact lens 12, for example, in the lens of the additional power + 2.5D shown in FIG. 3, the inner peripheral edge of the second correction region 24 in which the lens power is set to ⁇ 4.0D and The outer peripheral edge of the first correction region 22 whose lens power is set to ⁇ 1.5D is directly connected on the circumference having a radial distance of 1.0 mm from the lens geometric center, and 2.5D on the circumference.
  • the step-like frequency change point may be set.
  • the outer peripheral edge of the first correction region 22 whose power is gradually changed from ⁇ 1.5D to ⁇ 3.5D is directly connected on the circumference with a radial distance of about 1.3 mm from the lens geometric center.
  • a step change frequency of 0.5D may be set on the circumference.
  • the lens power of the second correction region 24 varies by, for example, 0.5D in both the bifocal type and progressive type presbyopia contact lenses 12 and 14.
  • What is set in multiple stages is prepared, and further, in addition to the lens power of the second correction area 24 of each stage, the additional power of the first correction area 22 is changed to, for example, multiple stages different every 0.5D.
  • the set items will be prepared in combination.
  • the addition power (ADD) is +4.50, +4.00,. What was sequentially made different in a plurality of stages is prepared for each set power of the BASE lens power for correction (generally, the lens power for correcting myopia) required for the distance vision of the user.
  • the addition power is sequentially changed to a plurality of stages such as +0.50, +1.00. Those prepared for each set power of the correction BASE lens power required for the user's distance vision are adopted.
  • the upper limit value of the additional power to be prepared is smaller in the progressive type presbyopia contact lens 14 than in the bifocal type.
  • the lower limit value of the added power to be prepared can be larger for the bifocal type presbyopia contact lens 12 than for the progressive type.
  • the outer diameters ⁇ Cb and ⁇ Cp of the first correction regions 22 in the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 are 0.5 mm ⁇ ⁇ Cb, ⁇ Cp ⁇ 5. It is preferably set within the range of 0 mm, more preferably within the range of 1.0 mm ⁇ ⁇ Cb, ⁇ Cp ⁇ 2.0 mm.
  • the outer diameters ⁇ Db and ⁇ Dp of the second correction regions 24 in the presbyopic contact lenses 12 and 14 are preferably set to 8.0 mm ⁇ ⁇ Db and ⁇ Dp, and more preferably 7.0 mm ⁇ ⁇ Db. , Dp.
  • the radial direction change rate of the lens power in the first correction region 22 and the second correction region 24 is preferably 1 (D / mm) or less.
  • the lens power difference (addition power) between the first correction area 22 and the second correction area 24 connected in the transition area 26 is not particularly limited, and the 0. It may be smaller than 5D or larger than 2.5D.
  • the radial direction change rate (D / mm) of the lens power set in the transition region is not limited.
  • the radial width dimension of the transition region 26 may be varied according to the lens power difference between the first correction region 22 and the second correction region 24.
  • the presbyopia contact lens for calculation has a shape as shown in FIGS. 2A and 2B and has the optical characteristics shown in FIGS.
  • These are progressive type presbyopia contact lenses 14, both of which are made of “2WEEK Menicon Premio” (trade name) material by Menicon Co., Ltd., base curve (BC): 8.6 mm, outside the lens
  • the diameter (DIA.) Is assumed to be 14.2 mm
  • CT center thickness
  • the calculation results of the modulation transfer function in such a presbyopia contact lens are shown in FIGS.
  • the modulation transfer function shown in FIGS. 5 and 6 shows the relative change in the contrast of the image when the through focus, that is, the focal position is changed, and the horizontal axis indicates the lens power (D) calculated from the focal position.
  • the vertical axis represents the relative contrast intensity, that is, the resolution.
  • the solid line represents the added power +0.50 D
  • the broken line represents the added power +1.50 D
  • the alternate long and short dash line represents the calculated value of each lens.
  • the lens power at these peaks is the near lens power and the far lens power set for the bifocal type presbyopia contact lens 12. That is, one of the peaks of the modulation transfer function appears at a position of approximately ⁇ 4.00 D, which is the distance lens power, and another peak indicating high resolution is ⁇ 3.50 D depending on the added power of each lens. , -2.50D and -1.50D.
  • the notable peak in the modulation transfer function is not only the lens power but also the number or size, the setting value of the additional power It is recognized that it differs depending on the case. Specifically, when the addition power is as small as + 0.50D, one large peak is substantially recognized so as to be combined with the distance lens power ( ⁇ 4.00D), and at the bottom of the peak. The power range is greatly expanded and the depth of focus is increased. As the addition power increases to + 1.50D and + 2.50D, the maximum peak value decreases and a plurality of peaks of approximately the same degree are recognized, and the distance lens power ( ⁇ 4.00D) is increased. The peak value is also small.
  • two distinct peaks corresponding to the distance lens power and the near lens power are recognized in the calculation result shown in FIG. High contrast can be obtained at each of the points of use and near points. These two peaks are recognized to have substantially the same size that sufficiently exceeds the evaluation reference line 28 as compared with many small peaks that are less than the evaluation reference line 28.
  • the difference between the distance lens power and the near lens power is large, for example, when the additional power is + 2.50D, the one is clearly focused in the far or near viewing state.
  • the other is greatly defocused.
  • the brain can easily select one focus image and stably obtain a clear appearance.
  • the image of the other image with respect to the one focused image is displayed in one of the far and near viewing states.
  • the degree of defocus is reduced, and the difference between the two is reduced. Therefore, it is difficult for the brain to select only one focus image, and it is considered that the quality of the appearance may be deteriorated by recognizing the double of the defocus image.
  • the progressive type contact lens 14 for presbyopia when the difference between the distance lens power and the near lens power is small as in the case of + 0.50D, a single focal point substantially has a single focal point. A resolution close to is obtained with a wide depth of focus. Therefore, it becomes possible to recognize the target image as a single focused image without blurring in a wide viewing area from the distance point to the near point, and a stable appearance can be obtained. it is conceivable that.
  • FIG. 8 shows the measurement result of the modulation transfer function in the single focus type contact lens.
  • the evaluation reference line 28 shown in FIGS. 5 and 6 is a line of 25 (%) with respect to the maximum value of the modulation transfer function of the single focus lens of the comparative example, and has a level that can be clearly seen in practice. It is a representation.
  • the presbyopia of this embodiment is configured to include a lens set composed of a plurality of combinations of the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 as described above.
  • the visual contact lens set 10 not only the optical characteristics as shown in FIGS. 3 and 4 but also the modulation transfer function as shown in FIGS. Any type is selected and applied for each user based on the selection criteria provided by the selection criteria information body 15.
  • the selection criterion information to be considered when selecting both types of presbyopia contact lenses 12 and 14 is information on the visual target distance assumed in near vision and the presbyopia contact lens user. Contains information on accommodation ability remaining in the wearer's eye.
  • the information of the visual recognition target distance assumed in the near vision of the former is, for example, the distance from the wearing eye to the visual recognition target during the near vision work of the presbyopic contact lens user, and wears the presbyopic contact lens. This is a near distance that the user desires to be visible without substantially blurring.
  • the specific numerical value of the visual recognition target distance is not limited at all. For example, a general visual target distance is about 33 cm for reading or the like, but a larger value for the visual target distance can be selected for operations such as personal computer input, while a smaller value is required for precise work. Can be selected.
  • the visual recognition target distance assumed in near vision is information set for each user mainly in accordance with the living environment of the user.
  • the information on the adjustment ability remaining in the wearing eye of the latter presbyopic contact lens user is focused on the adjustment ability remaining when the contact lens for presbyopia is worn, that is, on a nearby object possessed by the user's eye optical system.
  • D the ability to match.
  • the method for measuring the accommodation ability remaining in the presbyopic eye is, for example, as follows.
  • a contact lens or spectacles having a lens power for enabling a far distance of a predetermined distance to be visually recognized is worn on the target eye so that the far distance can be focused.
  • a visual acuity table using a Landolt ring or the like may be employed for confirming that the target distance is visible.
  • a visual object such as a newspaper is slowly brought close to the eyes. Then, the distance from the point where the recognition of the character is difficult due to blurring of the paper surface to the target eye is measured.
  • a newspaper or the like may be held in a blurred state in front of the eyes, and slowly moved away from it to measure the distance from the point where the character can be recognized to the target eye.
  • the average value may be calculated by sequentially performing these measurements or repeating the same measurement a plurality of times.
  • Presbyopia is generally understood as a state of mature presbyopia in which the target near point cannot be clearly seen, but there is a residual adjustment ability that can clearly see the target near point. Even in such a state, there is an early presbyopia to be corrected. In other words, in early presbyopia, the residual accommodation ability is greater than that of mature presbyopia, and when the viewpoint is shifted from far vision to near vision, the subject's own eye optics system is capable of focusing on nearby objects. Can often be combined. However, if you perform near-field work that requires you to continue to see the near distance that is visible with inferior adjustment ability for a long time, your eyes may be blurred, tired, or have headaches. Fatigue may appear as a symptom.
  • the symptoms of such presbyopia include, for example, a presbyopic contact lens in which a relatively small addition power is set, optically supplementing the residual adjustment ability, It is thought that it can be mitigated by giving a distance that can be clearly seen closer to the distance. In other words, it is considered that the symptom in early presbyopia can be alleviated by the subject performing the near-field work while leaving a surplus capacity in the adjustment ability.
  • a presbyopic contact lens in which a small addition power is set By applying a presbyopic contact lens in which a small addition power is set, near vision in early presbyopia can be improved.
  • the diopter value (a numerical value obtained by dividing 100 by the visual recognition target distance assumed in near vision) is approximately 3.0D.
  • the remaining adjustment ability is less than 3.0D, it is regarded as mature presbyopia in which it is impossible to focus on a nearby object with the adjustment ability of the subject himself / herself.
  • the residual adjustment capability is 1.5 times the required value (this If it is less than 4.5D in a specific example, it can be regarded as the above-mentioned initial presbyopia, which may cause symptoms such as eye strain when performing near work for a long time.
  • the presbyopia contact lenses 12 and 14 are applied.
  • the power added to the contact lens for presbyopia is a relatively small value in the case of early presbyopia, whereas it is a relatively large value in the case of mature presbyopia. Therefore, in the case of early presbyopia, the progressive type presbyopia contact lens 12 is preferably adopted, while in the case of mature presbyopia, the bifocal type presbyopia contact lens 14 is suitably adopted.
  • the lens type suitable for the user is objectively selected.
  • the information given by the selection reference information body 15 selects one of the presbyopia contact lenses 12 and 14 based on information on the visual recognition target distance assumed in near vision and the adjustment ability remaining in the wearing eye.
  • the following (A) to (E) are exemplified. Of these (A) to (E), (C), (D), and (E) can be employed in appropriate combination with other information.
  • (A) Using the additional power required to clearly view the visual target distance assumed for near vision in the user's eye optical system corrected with the lens power required for far vision, the index A selection criterion for instructing to select a progressive type when the additional power is smaller than the threshold and to select a bifocal type when the additional power is larger than the threshold. information.
  • the threshold of the additional power for selecting the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 is not particularly limited, and is preferably in the range of +0.5 to + 3.0D.
  • the value is more preferably set to a value within the range of +1.0 to 2.0D.
  • the threshold value is + 1.60D
  • the bifocal type presbyopia contact lens 12 is selected when the added power is greater than + 1.60D, while the progressive type is less than + 1.60D.
  • the contact lens 14 for presbyopia is selected.
  • a plurality of such threshold values may be determined. For example, when the first threshold value is + 1.00D and the additional power is smaller than the first threshold value (+ 1.00D), a progressive type presbyopia contact lens. 14 is selected, and the second threshold is set to + 1.75D. When the additional power is larger than the second threshold (+ 1.75D), the bifocal type presbyopia contact lens 12 is selected. You may be made to do. At this time, when an addition power intermediate between the first threshold (+ 1.00D) and the second threshold (+ 1.75D) is set, the bifocal type presbyopia contact lens 12 and the progressive type presbyopia are used. Any one of the visual contact lenses 14 may be selected by the user in consideration of experience, user's subjectivity, or the like, or may be selectable by providing another selection criterion.
  • This (C) gives a selection criterion in consideration of data regarding optical characteristics of the presbyopia contact lenses 12 and 14 statistically. Specifically, when the distance lens power is ⁇ 4.0D and the near lens power is ⁇ 3.5D (addition power is + 0.5D), the progressive type is used when the addition power is less than + 2.0D. The presbyopia contact lens 14 is selected.
  • (D) gives a selection criterion from a statistical point of view.
  • the distance lens power is ⁇ 4.0D and the near lens power is ⁇ 2.0D (additional power).
  • the additional power is + 2.0D or more as in (+ 2.0D)
  • the bifocal type presbyopia contact lens 12 is selected.
  • the additional power of the lens set as the difference between the distance lens power and the near lens power is obtained based on the viewing target distance assumed for near vision by the user and the adjustment ability remaining in the wearing eye. It is done. For example, when a bifocal type contact lens 12 for presbyopia is employed, the residual adjustment ability is multiplied by a factor such as 1/2 or 2/3 for the purpose of reducing eye strain by leaving the remaining power.
  • the adjustment methods for setting the coefficients to 1/2 and 2/3 are the 1/2 method in the bifocal type and the 2/3 method in the bifocal type.
  • the distance from the visual recognition target assumed in the near vision is closer to the distance from the purpose of reducing eye strain by leaving the remaining power.
  • the addition power of the lens is set so that a distance up to a distance obtained by multiplying the distance to be visually recognized by a coefficient such as 1/2 or 2/3 can be visually recognized.
  • [ ⁇ (the adjustment target distance assumed in near vision) ⁇ (1/2) ⁇ necessary adjustment ability to be visible] (residual adjustment ability) + (additional frequency)
  • the addition power calculation method for the lens can be adopted.
  • a distance obtained by multiplying the visual recognition target distance by 1 ⁇ 2 is a distance where the remaining power can be visually recognized.
  • a distance obtained by multiplying the visual recognition target distance by 2/3 is a distance where the remaining power can be visually recognized.
  • the adjustment methods for setting the coefficients to 1/2 and 2/3 are the 1/2 method in the progressive type and the 2/3 method in the progressive type.
  • the lens addition power calculation method described above is merely an example, and the addition power according to the present invention is not limited in any way.
  • the coefficient and calculation method of the adjustment method can be set according to the progress of presbyopia. For example, in the case of mature presbyopia, since a relatively high addition power is required and a large amount of remaining power is desired, a 1/2 method with a factor of 1/2 in the bifocal type presbyopia contact lens 12 is used. Preferably employed. On the other hand, in the case of early presbyopia, since a relatively small addition power is required and it is not necessary to increase the remaining power, the 2/3 method using a coefficient of 2/3 in the progressive type contact lens 14 for presbyopia Preferably employed.
  • the selection criterion information body 15 that provides the selection criterion information referred to in the lens type selection as described above in the present embodiment is a booklet that directly describes the selection criterion information using mathematical formulas, graphs, tables, etc.
  • an objective selection criterion is to select a bifocal type presbyopia contact lens 12 and a progressive type presbyopia contact lens 14. Based on the information, it is possible to easily and stably provide a presbyopic contact lens suitable for each user's wearing eye with high reliability.
  • the presbyopia contact lens set 10 of the present invention includes a bifocal type presbyopia contact lens 12 and a progressive type presbyopia contact lens 14 in the same set. Compared to receiving both types of presbyopia contact lenses 12 and 14 separately, the management and storage effort of presbyopia contact lenses by contact lens sellers is greatly reduced, and work efficiency is improved. Can be illustrated.
  • a bifocal type presbyopia contact lens set and a progressive type presbyopia contact lens set have been provided as separate products. Both types of presbyopia contact lenses are provided with common or similar characteristics. Therefore, the difference in wearing feeling and appearance between the bifocal-type presbyopic contact lens 12 and the progressive-type presbyopic contact lens 14 is suppressed as much as possible. The transition is smooth and the burden on the user is reduced.
  • a transition region 26 is provided between the first correction region 22 and the second correction region 24. ing. Therefore, when the field of view is changed from near vision to far vision, or from far vision to near vision, a smooth transition of the visual field is possible.
  • a contact lens set for presbyopia as a second embodiment of the present invention will be described.
  • the shape of the contact lens set for presbyopia, and the bifocal type presbyopia contact lens and the progressive type contact lens for presbyopia constituting the set are substantially the same as those in the above embodiment.
  • the illustration is omitted.
  • the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.
  • FIGS. 9 and 10 show specific examples of lens power distributions as optical characteristics of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens of the present embodiment, respectively. ing.
  • the first correction region 22 and the second correction in the respective optical parts of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens are reversed. That is, the first correction area 22 which is the central portion of the optical part is a distance area, while the second correction area 24 is a near area.
  • a transition region 26 is formed between the two regions 22 and 24.
  • each dimension in the optical part of this embodiment is made substantially equal to said 1st embodiment.
  • the distance lens power and the near lens power set in the first correction area 22 and the second correction area 24 are the same as those in the first embodiment. Are approximately equal. That is, the distance lens power is set to a constant value of ⁇ 4.00D, the additional powers are set to + 0.50D, + 1.50D, and + 2.50D, and the near lens power is set to ⁇ 3.50D, -2.50D and -1.50D are set.
  • the intermediate lens power set in the transition area 26 is set to an intermediate lens power between the near lens power and the far lens power.
  • the lens geometric center is set to ⁇ 4.00 D as the distance lens power.
  • + 0.50D, + 1.50D, and + 2.50D are set as the additional power
  • the near lens power is set to ⁇ 3.50D, ⁇ 2.50D, and ⁇ 1.50D.
  • the distance lens power is set so as to gradually change from ⁇ 4.00D to each near lens power from the lens geometric center to the inner peripheral edge of the first correction region 22.
  • the transition region 26 is also formed in the progressive type presbyopia contact lens of the present embodiment, and like the first embodiment, by design, like a part of the first power region 22 Is formed.
  • FIGS. 11 and 12 show the modulation transfer function (MTF) of the presbyopia contact lens of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens shown in FIGS. 9 and 10, respectively. It is shown.
  • the solid line is the added power + 0.50D
  • the broken line is the added power + 1.50D
  • the alternate long and short dash line is the added power + 2.50D.
  • the evaluation reference line 28 is shown as in FIGS. 5 and 6 of the first embodiment.
  • the bifocal type presbyopia contact lens 12 of the first embodiment is the bifocal type presbyopia contact lens 12 of the first embodiment.
  • the main peaks derived from the near lens power and the far lens power that is, the remarkable maximum values indicating high resolution, are clearly recognized in two places in the modulation transfer function.
  • the modulation transfer function of the progressive type presbyopia contact lens in this embodiment shown in FIG. 12 is the same as the modulation transfer function of the progressive type presbyopia contact lens 14 in the first embodiment. . That is, when the additional power is as small as + 0.50D, one large peak is substantially recognized so as to be combined with the distance lens power ( ⁇ 4.00D), and the power range at the bottom of the peak is It spreads greatly and the depth of focus also increases. As the addition power increases to + 1.50D and + 2.50D, the maximum peak value decreases and a plurality of peaks of approximately the same degree are recognized, and the distance lens power ( ⁇ 4.00D) is increased. The peak value is also small.
  • the bifocal type presbyopia contact lens in this embodiment also exhibits the same characteristics as the bifocal type presbyopia contact lens 12 in the first embodiment. That is, when the difference between the distance lens power and the near lens power is large, for example, when the additional power is + 2.50D, the one is clearly focused and the other is visually focused in the far or near viewing state. Is greatly defocused. On the other hand, when the difference between the distance lens power and the near lens power is small, such as the addition power of + 0.50D, the image of the other image with respect to the one focus image is viewed in the far or near viewing state. The degree of focus is reduced, and the difference between the two is reduced.
  • the type of presbyopia contact lens in this embodiment also exhibits the same characteristics as the bifocal type presbyopia contact lens 12 in the first embodiment.
  • the difference between the distance lens power and the near lens power is small as in the case of + 0.50D, a resolution close to a single focus can be obtained with a wide depth of focus due to one large peak. It becomes.
  • the difference between the distance lens power and the near lens power is large, for example, when the additional power is + 2.50D, all of the generated peaks are small and the overall resolution is low. End up.
  • a large additional power is set.
  • a bifocal type presbyopic contact lens is suitable, and when a small addition power is set, a progressive type presbyopic contact lens is considered suitable.
  • the same method of selecting a bifocal type presbyopia contact lens and a progressive type presbyopia contact lens as in the first embodiment can be adopted, and this embodiment
  • the contact lens set for presbyopia in can also achieve the same effect as the first embodiment.
  • Example 1 in which a bifocal type contact lens for presbyopia or a progressive type contact lens for presbyopia is selected from the contact lens set for presbyopia according to the selection method described in the first and second embodiments below. -3 will be described. In addition, this Example does not limit this invention at all.
  • Example 1 In Example 1, a bifocal type contact lens for presbyopia with high addition power (High: + 2.00D to + 3.00D), a bifocal type old with low addition power (Low: + 0.50D to + 1.50D) Contact lens for vision, high addition power (High: + 2.00D to + 3.00D) progressive type contact lens for presbyopia, low addition power (Low: + 0.50D to + 1.50D) for progressive type presbyopia
  • high addition power High: + 2.00D to + 3.00D
  • progressive type contact lens for presbyopia high addition power
  • low addition power Low addition power for + 0.50D to + 1.50D
  • each subject corrected his / her visual acuity to focus on a distant visual acuity, and determined whether or not a nearby newspaper was recognizable by such an eye optical system.
  • a nearby newspaper was fixed to 33 (cm). That is, the visual recognition target distance assumed in the near vision according to the embodiment is set to 33 (cm), and the adjustment ability for recognizing the distance is about 3D. Therefore, if each subject can recognize a nearby newspaper, the remaining adjustment capability is greater than 3D, and if it cannot be recognized, the remaining adjustment capability is less than 3D.
  • each subject was classified into two types, namely, the residual accommodation ability 3D, ie, the residual accommodation ability high, that is, the early presbyopia, that is, the residual accommodation ability small, that is, the mature presbyopia.
  • the above four types of presbyopia contact lenses can be worn on the subject so that the visual acuity in the distance and the newspaper in the vicinity can be clearly seen, or the image is blurred or distorted so that it cannot be clearly seen. It was judged. Then, among the subjects wearing the presbyopia contact lens, the number of persons who can clearly see both far vision and near vision was confirmed, and this ratio was expressed as a percentage as an adaptation rate.
  • the selection method of the present invention has a high addition frequency for patients with mature presbyopia, for example.
  • a bifocal type presbyopia contact lens is selected, or a progressive type presbyopia contact lens with a small additional power is selected for a patient with early presbyopia.
  • Example 2 In Example 2, assuming a subject exhibiting symptoms of presbyopia, a specific method 1 for selecting the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens described in the above embodiment is described. An example is shown in Table 2. For example, the information described in Table 2 can be adopted as selection criterion information, and can be provided to the subject and the contact lens prescriber by the selection criterion information body 15.
  • the visual recognition target distance assumed in near vision is determined to be 33 (cm), and accordingly, the necessary adjustment capability is determined to be 3.0D.
  • the visual acuity is corrected so that a far distance (infinite in the table) of a predetermined distance can be visually recognized.
  • an object is gradually brought closer to the eye from a distance.
  • a range in which the object is clearly visible in front of the eyes without blurring is defined as the clear vision area.
  • the clear visual range is ⁇ to 100 (cm), that is, the object cannot be clearly seen in front of the eyes from 100 (cm).
  • 100 / F is calculated with F (cm) as the distance to the front of the eye in the clear vision region.
  • the near object is positioned at 33 (cm) in front of the eyes, and a subject whose clear visual range is wider than ⁇ to 33 (cm) can be recognized, so that it is judged as “good”.
  • the adjustment ability necessary to make such an object visible is 3.0D, and a target person having a remaining adjustment ability of 3.0D or more can be recognized.
  • the bifocal type is selected as the optimal presbyopia contact lens for subjects who are determined to have presbyopia. Also, the bifocal type 1/2 method is selected as the adjustment method, and the optimum addition power is calculated based on the required adjustment ability and the remaining adjustment ability of the wearing eye.
  • the subject whose circle of near object visual recognition is ⁇ is presbyopia or that presbyopia has not progressed to early presbyopia.
  • the 2/3 method in the progressive type is selected as the adjustment method, and the optimum addition power is calculated based on the required adjustment ability and the remaining adjustment ability of the wearing eye.
  • a subject with such an additional power greater than 0 is determined to be presbyopia and a progressive type presbyopia contact lens is selected.
  • the subject whose degree of addition is 0 or smaller than 0 as a result of calculation is determined that presbyopia has not progressed to early presbyopia, and a single focus type contact lens is selected in this embodiment. Has been.
  • either the bifocal type presbyopia contact lens or the progressive type presbyopia contact lens is selected from the presbyopia contact lens set and the optimum addition power is determined by the above method.
  • a single focus type contact lens is selected for a subject who has not progressed presbyopia until initial presbyopia, that is, a subject who does not need to set an additional power.
  • Example 3 In Example 3, assuming a subject who exhibits symptoms of presbyopia, specific different methods for selecting the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens described in the above embodiment are described. An example is shown in Table 3.
  • the near object position that is, the visual recognition target distance assumed in near vision is set to 20 (cm), and thus the adjustment capability required is 5.0D. Since the specific selection method is the same as that in the second embodiment, detailed description is omitted. However, in brief, the subject whose residual adjustment ability is 5.0 D or less is determined to be presbyopia. . As a result, a bifocal type presbyopia contact lens is selected, and the 1 ⁇ 2 method in the bifocal type is selected as the adjustment method, and the optimum addition power is calculated.
  • a subject whose residual adjustment ability is less than 5.0D to 7.5D is determined to be presbyopia and a progressive type contact lens for presbyopia is selected, and a 2/3 method in the progressive type is used as an adjustment method. Once selected, the optimal addition power is calculated. Further, it is determined that a subject whose residual adjustment ability is 7.5D or more has not progressed to presbyopia until initial presbyopia, and in this embodiment, a single focus type contact lens is selected.
  • the optimum addition power set at the switching point between the 1/2 method and the 2/3 method in the bifocal type and the progressive type.
  • the optimum added power calculated by the 1/2 method and the 2/3 method in the progressive type is set so as to complement the power difference. Therefore, for example, even if the viewing target distance assumed in near vision changes, the bifocal type presbyopia contact lens 12 having a large additional power and the progressive type presbyopia contact lens 14 having a small additional power are effective. Can be understood.
  • FIG. 1 shows a mode in which a bifocal type presbyopia contact lens 12 and a progressive type presbyopia contact lens 14 are added with different addition frequencies.
  • the number of added frequencies may be one.
  • a presbyopia contact lens having a lens power distribution as shown in FIG. 13 may be adopted, or as a progressive type presbyopia contact lens 14
  • a presbyopic contact lens having a lens power distribution as shown in FIG. 14 may be employed. That is, in the above-described embodiment, the intermediate lens power set in the transition area 26 changes linearly from the near lens power to the far lens power or smoothly so as to gradually approach the lens power. Not. In short, in a predetermined area of the transition area 26, an intermediate lens power between the near lens power and the far lens power may be provided constant.
  • the lens power distributions shown in FIGS. 13 and 14 are similar to the lens power distributions shown in FIGS. 3 and 4, respectively.
  • the outer peripheral portion of the first correction area 22 is a distance area that is the second correction area 24.
  • a plurality of fixed lens powers are provided in the transition area 26, and are changed stepwise from the near lens power to the far lens power.
  • the presbyopia contact lenses having a near vision area and a far vision area are broadly divided into two types, a simultaneous vision type and an alternate vision type.
  • Patent Documents 1 to 3 show alternating vision type presbyopia contact lenses, in which the lower half of the optical part is a near area, while the upper half of the optical part is a distant area. It is an area for use.
  • Patent Documents 4 and 5 show a simultaneous vision type presbyopia contact lens, and a near area and a far area are provided concentrically in an optical part.
  • the bifocal type presbyopia contact lens 12 and the progressive type presbyopia contact lens 14 of the embodiment are both of the simultaneous vision type, they may be of the alternate vision type.
  • one of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens may be a simultaneous vision type, and the other may be an alternate vision type. It is preferable to be adopted.
  • one of the near lens power and the far lens power set in the first correction region 22 and the second correction region 24 is constant.
  • the constant region may be substantially zero, that is, the lens power may gradually change over the entire optical unit.
  • both the lens powers set in the first correction region 22 and the second correction region 24 are made constant. May be provided so as to change gradually.
  • at the boundary between the first correction region 22 and the second correction region 24 at the boundary between the first correction region 22 and the second correction region 24 (a point at a distance of 1.5 mm from the lens geometric center). The lens power changes smoothly without a break point, and a smoother transition between near vision and far vision can be realized.
  • the region where the lens power is constant includes a case where there is a slight power change due to spherical aberration or the like.
  • FIG. 17A shows an example of the measurement result of the lens power distribution in a bifocal type presbyopia contact lens in which a certain different lens power is set for the central portion and the outer peripheral portion of the optical portion.
  • FIG. 17B shows an enlarged view at the outer peripheral end of the central portion of the optical part of the bifocal type presbyopia contact lens in FIG.
  • FIG. 18 shows an enlarged view at the outer peripheral end of the central portion of the optical part of the bifocal type presbyopia contact lens in FIG.
  • FIG. 18 the lens power distribution in the progressive type presbyopia contact lens in which the central portion of the optical unit is a gradually changing lens power while the lens power of the outer peripheral portion of the optical unit is constant.
  • FIGS. 17 (a), 17 (b), and 18 An example of the measurement result is shown.
  • the optical portion central portion and the outer peripheral portion of the bifocal type presbyopia contact lens which are set regions having a constant lens power
  • a power change that is considered to be mainly caused by spherical aberration, which increases toward the outer peripheral side is recognized as an actual measurement value.
  • Such a deviation occurs as a spherical aberration when a region where the lens power set for the contact lens is constant is manufactured as a spherical shape, and is constant even if a slight power change occurs. Should be considered as the lens power.
  • the bifocal type presbyopia contact lens may be, for example, a diffractive presbyopia contact lens in which the near and far regions are alternately provided concentrically.
  • at least one of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens may be set with a lens power for correcting astigmatism, that is, a toric lens.
  • at least one of the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens may not have an optical portion at the center of the contact lens. That is, the optical unit may be deviated from the center of the contact lens in any direction in the circumferential direction, and may be a so-called decenter lens. At that time, a mark or the like for determining the circumferential direction of the contact lens may be attached, or the peripheral portion of the contact lens may be partially thick or thin to exert a positioning effect. .
  • the residual accommodation ability is measured with both eyes, and either a bifocal type presbyopia contact lens 12 or a progressive type presbyopia contact lens 14 is the same type of presbyopia contact lens. It is worn on both eyes.
  • a progressive type presbyopia contact lens 14 is used for an eye with a large residual accommodation ability, and a bifocal type old age for an eye with a small residual accommodation ability.
  • a wearing method called wearing a visual contact lens 12, that is, called monovision or modified monovision, is also possible.
  • the method for measuring the residual adjustment ability is not limited to the method described in the above embodiment, and for example, the residual adjustment ability may be objectively measured by a device such as a perimeter or an accomodo poly recorder.
  • the bifocal type presbyopia contact lens and the progressive type presbyopia contact lens are not limited to the circular shape as in the above embodiment.
  • both the presbyopia contact lenses may be elliptical, or may be truncation lenses in which a predetermined region on the lower side of the contact lens is cut in the chord direction.

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  • Eyeglasses (AREA)

Abstract

L'invention concerne un ensemble de lentilles de contact pour presbytie, et un procédé de sélection des lentilles de contact pour presbytie avec lequel des lentilles de contact pour presbytie d'un type adapté à chaque utilisateur peuvent être fournies efficacement. Un ensemble (10) de lentilles de contact pour presbytie est configuré en combinant chacun d'une pluralité de types de lentilles de contact pour presbytie de type bifocal (12) et de lentilles de contact pour presbytie de type progressif (14) qui présentent chacun des zones de lecture (22) et des zones de distance (24) qui y sont disposées, ladite pluralité de types ayant différentes puissances des lentilles déterminées dans chacune des zones de lecture (22) et des zones de distance (24). Les lentilles de contact pour presbytie de type bifocal (12) et les lentilles de contact pour presbytie de type progressif (14) sont sélectionnées et fournies sur la base d'informations de référence de sélection comprenant une distance supposée des objets à visualiser dans la vision de près et le reste de la capacité d'accommodation des yeux d'un porteur.
PCT/JP2013/000899 2013-02-19 2013-02-19 Ensemble de lentilles de contact pour presbytie et procédé de sélection des lentilles de contact pour presbytie WO2014128744A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2013/000899 WO2014128744A1 (fr) 2013-02-19 2013-02-19 Ensemble de lentilles de contact pour presbytie et procédé de sélection des lentilles de contact pour presbytie
JP2013557973A JP5525114B1 (ja) 2013-02-19 2013-02-19 老視用コンタクトレンズセット

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PCT/JP2013/000899 WO2014128744A1 (fr) 2013-02-19 2013-02-19 Ensemble de lentilles de contact pour presbytie et procédé de sélection des lentilles de contact pour presbytie

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WO2014128744A1 true WO2014128744A1 (fr) 2014-08-28

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US9201250B2 (en) 2012-10-17 2015-12-01 Brien Holden Vision Institute Lenses, devices, methods and systems for refractive error
US9541773B2 (en) 2012-10-17 2017-01-10 Brien Holden Vision Institute Lenses, devices, methods and systems for refractive error
JP6188974B1 (ja) * 2017-01-24 2017-08-30 Hoya株式会社 眼用レンズ、その設計方法、その製造方法、および眼用レンズセット
KR20170136520A (ko) * 2015-04-13 2017-12-11 가부시끼가이샤 메니콘 근시 진행 억제용 콘택트 렌즈 및 그 설계 방법 및 제조 방법
JP2019082670A (ja) * 2017-10-28 2019-05-30 鄭 克立ＺＨＥＮＧ Ｋｅｌｉ ホログラフィック眼鏡
WO2019189091A1 (fr) * 2018-03-27 2019-10-03 ホヤ レンズ タイランド リミテッド Procédé de conception et procédé de fabrication d'une paire de verres de lunettes, et paire de verres de lunettes
GB2621676A (en) * 2022-06-21 2024-02-21 Coopervision Int Ltd Contact lenses and methods relating thereto

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EP3179294B1 (fr) * 2014-08-08 2024-04-17 Menicon Co., Ltd. Procédé de production de lentille ophtalmique multifocale diffractive et lentille ophtalmique multifocale diffractive
JP6943523B2 (ja) * 2017-05-18 2021-10-06 興和株式会社 眼用装置

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KR102522801B1 (ko) 2015-04-13 2023-04-19 가부시끼가이샤 메니콘 근시 진행 억제용 콘택트 렌즈 및 그 설계 방법 및 제조 방법
JP2018120040A (ja) * 2017-01-24 2018-08-02 Hoya株式会社 眼用レンズ、その設計方法、その製造方法、および眼用レンズセット
US11409132B2 (en) 2017-01-24 2022-08-09 Hoya Corporation Ophthalmic lens, method for designing the same, method for manufacturing the same, and ophthalmic lens set
WO2018138931A1 (fr) * 2017-01-24 2018-08-02 Hoya株式会社 Lentille ophtalmique, procédé de conception associé, procédé de fabrication associé, et ensemble de lentilles ophtalmiques
JP6188974B1 (ja) * 2017-01-24 2017-08-30 Hoya株式会社 眼用レンズ、その設計方法、その製造方法、および眼用レンズセット
JP2019082670A (ja) * 2017-10-28 2019-05-30 鄭 克立ＺＨＥＮＧ Ｋｅｌｉ ホログラフィック眼鏡
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WO2019189091A1 (fr) * 2018-03-27 2019-10-03 ホヤ レンズ タイランド リミテッド Procédé de conception et procédé de fabrication d'une paire de verres de lunettes, et paire de verres de lunettes
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GB2621676A (en) * 2022-06-21 2024-02-21 Coopervision Int Ltd Contact lenses and methods relating thereto

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