WO2014050879A1 - 近視進行抑制能を有するコンタクトレンズおよび近視進行抑制能を有するコンタクトレンズセット - Google Patents
近視進行抑制能を有するコンタクトレンズおよび近視進行抑制能を有するコンタクトレンズセット Download PDFInfo
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- WO2014050879A1 WO2014050879A1 PCT/JP2013/075892 JP2013075892W WO2014050879A1 WO 2014050879 A1 WO2014050879 A1 WO 2014050879A1 JP 2013075892 W JP2013075892 W JP 2013075892W WO 2014050879 A1 WO2014050879 A1 WO 2014050879A1
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- lens
- contact lens
- optical unit
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- myopia progression
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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
- G02C7/047—Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae
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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
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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
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/04—Lenses comprising decentered structures
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/06—Special ophthalmologic or optometric aspects
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/24—Myopia progression prevention
Definitions
- the present invention relates to a technique of a contact lens having a myopia progression suppressing ability used for suppressing the progression of myopia and myopic astigmatism in the human eye.
- myopia in the human eye not only causes inconvenience in daily life, but also increases the risk of possessing lesions such as retinal detachment and cataract as myopia becomes more advanced.
- the prevalence of myopia has increased, so the social demand for myopia progression suppression technology has also increased.
- a myopia progression suppression technique based on an adjustment lag theory using a contact lens and an off-axis aberration theory has been proposed.
- the progression of myopia in children is often due to the progression of axial myopia, triggered by a hyperopic focus error that focuses outside the retina, and the retina stretches to compensate for this hyperopic focus error.
- the adjustment lag theory means that the auto-focus mechanism of the human eye does not respond 100% to the required amount of adjustment, but as a result of trying to work with the minimum amount of adjustment, there is a need for adjustment.
- an adjustment lag which is a hyperopic focus error due to insufficient adjustment, will occur, and the greater the distance work, the more the nearsighted focus error triggers the extension of the axial length and the progress of myopia It is to do.
- off-axis aberration theory means that the shape of the eyeball of myopic eyes tends to be flat in the direction of the axis of the eye. An error occurs, and this triggers the extension of the axial length to advance myopia.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2007-511803
- Patent Document 2 WO96 / 16621
- the contact lens that corrects the hyperopic focus error causes the light incident on the pupil to focus on the retina or in front of the retina.
- the present inventor has repeatedly studied the contact lens for suppressing myopia progression of such a conventional structure, and in order to obtain the target effect of suppressing myopia progression, the hyperopic focus error in the peripheral portion of the retina is corrected.
- an addition power as high as +2.0 D (diopter) is required.
- the light collection rate on the retina during far vision is reduced, or a near-focus focus error is generated, and the subjective QOV (quality of view) is reduced.
- Became clear since the contact lens for suppressing myopia is often worn for a long period of time for children, the QOV equivalent to that of a normal refractive correction contact lens cannot be obtained, resulting in problems in daily life.
- the invention described in Patent Document 2 is a spherical aberration-like power that gradually shifts toward the plus diopter side toward the outer peripheral side in the lens radial direction in addition to the focal point in an appropriate myopia correction state on the optical axis.
- Setting is performed to set a focal point closer to the cornea on the optical axis, thereby correcting a hyperopic focus error.
- there is no clear focus like a progressive multifocal lens and like the one described in Patent Document 1, there is a problem that it is difficult to avoid a large decrease in QOV.
- a higher addition power of about + 2.0D than the appropriate myopia correction state is set, which may hinder daily life. There was also.
- the present invention has been made in the background as described above, and the problem to be solved is to prevent the myopia progression by adjusting the lag theory or the off-axis aberration theory, and to prevent the peripheral part of the retina or light.
- the addition power required to correct the focal error of hyperopia on the axis can be set small and appropriately, and it is as good as normal refractive contact lenses that do not interfere with daily life. It is an object of the present invention to provide a contact lens having a novel ability to suppress myopia progression that can obtain a satisfactory QOV.
- the first aspect of the present invention is a contact lens in which a refractive correction power for correcting myopia and myopic astigmatism is set in the central region of the optical unit, and myopic and myopic astigmatism higher than the refractive correction power of the central region.
- a positive addition power is set in the peripheral area of the optical unit in comparison with the central area in order to correct the hyperopic focus error, and in the wearing state
- Positioning means for specifying the circumferential position is provided, and the lens optical axis of the optical unit is biased and set so as to coincide with the line of sight of the human eye when worn by the positioning means.
- This is a contact lens having the ability to suppress myopia progression.
- the present inventor studied a contact lens for suppressing myopia progression having a conventional structure, and as a result, a large addition power as described above is required, so that the QOV is reduced.
- the main cause of the conventional problem is a shift between the line of sight and the optical axis of the lens in the wearing state of the contact lens for suppressing myopia progression. That is, in the normal eye, as shown in FIG. 9A, the focal position is adjusted on the retina in both the central part and the peripheral part of the retina, but in the myopic eye, as shown in FIG. 9B.
- the contact lens for suppressing myopia progression having a conventional structure, an addition power region of a plus diopter is provided, and the focal position of the peripheral portion of the retina is set on the retina or in front of the retina.
- the contact lens for suppressing myopia progression tends to deviate the stable position on the cornea or the conjunctiva due to the curvature distribution of the cornea and the like. As shown in FIG. And the optical axis of the lens shift. Due to this deviation, on the front side in the deviation direction (right side in FIG.
- the focal position is displaced to the rear side of the retina. Therefore, in order to obtain a target myopia progression suppression effect by setting the focal position on the retina or in front of the retina over the entire periphery of the retina, a lens that provides the focal position a in FIG. Is not sufficient, and a lens providing the focal position b in the figure is required. On the other hand, in the lens providing the focal position b, the focal position is excessively nearer to the retina on the rear side in the shift direction (left side in FIG. 10). As a result, excessive addition power is partially set, and myopia focus error is unevenly generated in the periphery of the retina, and non-target high-order aberrations such as coma are generated.
- the problem caused by the difference between the eye sight line and the lens optical axis when the lens is worn as described above is that the power change is set from the lens optical axis to the outer periphery of the lens optical unit. The same applies to the case where multi-focus is set for.
- the optical axis of the lens of the optical unit matches the line of sight of the human eye. 1, even if the stable position on the cornea 12 of the contact lens 10 having the ability to suppress myopia progression is biased to the ear side or the like, as shown in FIG.
- the amount of deviation between the 14 sight lines 16 and the lens optical axis 18 can be reduced, and the sight line 16 and the lens optical axis 18 can be preferably matched.
- the focus position is set on the retina or in front of the retina over the entire periphery of the retina, or an additional focus is set on the cornea side than the focus that is in an appropriate myopia correction state on the lens optical axis. It is no longer necessary to set the addition power required for the lens too high, and the focal position in the periphery of the retina can be set to a position close to the retina, or an appropriate myopia correction power and appropriate addition can be set on the lens optical axis. It is possible to set an additional focus in degrees. That is, in the contact lens 10 having the myopia progression suppressing ability having the structure according to the present invention, the addition lens power is insufficient to obtain the myopia progression suppressing effect in the conventional myopia progression suppressing contact lens shown in FIG.
- the focal position is set on the retina or in front of the retina over the entire periphery of the retina, as shown in the focal position A of FIG. It can be done.
- an image obtained by appropriate visual acuity correction that is visually recognized on the line of sight of the eye can be obtained with an appropriate myopia correction power set on the lens optical axis.
- the lens can be visually recognized stably, and adverse effects due to the addition power set on the outer peripheral side of the lens can be avoided, and an excessive setting of the lens power can be made unnecessary for the optical region that gives each focal point on the optical axis.
- the lens optical axis of the optical unit is aligned with the eye sight line in consideration of the relative shift of the focal position with respect to the retina due to the addition lens power.
- the myopia correction power and / or addition power can be set lower than those of conventional contact lenses for suppressing myopia progress, and the same myopia progress suppression effect can be enjoyed. Is possible.
- the shift amount of the focal position with respect to the retina small and substantially uniform over the entire periphery of the retina.
- an increase in asymmetric higher-order aberrations such as coma aberration can be suppressed, so that the quality of appearance (QOV) under wearing conditions can be maintained well, and the burden on the wearer is reduced.
- the target myopia progression suppression effect can be obtained while significantly reducing the above.
- a maximum value of the addition power set in the peripheral region of the optical unit is +0.25 to +1. Within the range of less than 0.000 diopters.
- the contact lens having the ability to suppress myopia progression according to the present aspect is sufficiently wide as long as a good myopia progression suppression effect can be obtained as compared to the conventional technology in which the addition power of about +2.0 diopters is generally set. A small addition power is adopted, and the QOV at the time of wearing can be maintained as well as a normal refractive correction contact lens.
- a third aspect of the present invention is a contact lens having the ability to suppress myopia progression according to the first or second aspect, wherein the optical part is added to the optical part by the addition power set in the peripheral region of the optical part.
- positive spherical aberration is given, and the lens optical axis of the optical unit coincides with the line of sight of the human eye when worn by the positioning means and the lens optical axis deviating structure of the optical unit. Therefore, the depth of focus is increased without causing a decrease in the subjective QOV accompanying an increase in asymmetric high-order aberrations such as coma.
- the deviation between the lens optical axis of the optical unit and the line of sight of the human eye can be suppressed by the lens optical axis deviation structure in the worn state.
- asymmetric high-order aberrations such as coma aberration can be suppressed, so that only the optical characteristic to which positive spherical aberration is imparted by setting a positive addition power can be skillfully used as the depth of focus.
- the correction effect of the hyperopic focus error can be further improved by using the depth of focus in the vicinity of the fovea and the peripheral part.
- a contact lens having the ability to suppress myopia progression according to any one of the first to third aspects, wherein the addition power in the peripheral region of the optical unit is equal to that of the optical unit. It is set so that the correction amount of the focus error is increased by gradually changing in a stepless manner from the central side toward the outer peripheral side.
- the contact lens having the ability to suppress myopia progression since the positive addition power is continuously changed from the central side to the outer peripheral side of the optical unit, it is focused on the retinal position of the human eye. The position can be adjusted with higher accuracy.
- a contact lens having the ability to suppress myopia progression according to the fourth aspect, wherein the addition power in the peripheral region of the optical unit is from the central side to the outer peripheral side of the optical unit. Is set so that the correction amount of the focus error increases steplessly in a stepwise manner, and a region with a maximum and constant addition power is present in the outermost peripheral portion of the peripheral region of the optical unit. It is provided in an annular shape with a predetermined width.
- the contact lens with the ability to suppress myopia progression of this aspect can be tuned to improve the visibility of the object in a specific distance range by the annular maximum addition power correction area provided in the outermost peripheral part of the optical part Thus, the degree of freedom in setting the optical characteristics can be improved.
- a sixth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to third aspects, wherein the addition power in the peripheral region of the optical part is the optical part of the optical part.
- the focus error correction amount is set so as to increase stepwise from the center side toward the outer periphery side.
- a specific addition power is set for each of the correction regions formed concentrically in the peripheral region of the optical unit, so that the design and measurement of optical characteristics, etc. Can be easily performed. Further, by adjusting each additional power value in each of the plurality of correction regions formed concentrically and the respective radial width dimensions and areas, a large degree of freedom in setting the optical characteristics can be ensured.
- a seventh aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to sixth aspects, and an optical surface that provides the addition power in the peripheral region of the optical unit, It is set to at least one of the lens front surface and the lens rear surface.
- the addition optical surface of the addition power is not specified as any one of the front and rear surfaces of the lens, but the required optical characteristics and dimensions, the manufacturing method employed, etc.
- the addition optical surface for the addition power is selected and set. For example, by setting the addition power on the front surface of the lens, it is possible to make the rear surface of the lens a curved surface corresponding to the cornea shape, and by setting the addition power on the rear surface of the lens, a mold for the front surface of the lens It is also possible to make the manufacturing easier by reducing the number of types.
- the addition power can be set to be shared between the front surface of the lens and the rear surface of the lens, and even when the addition power is high, the shape change on the front surface of the lens and the rear surface of the lens can be suppressed to a small value.
- An eighth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to seventh aspects, wherein astigmatism is observed on at least one of the lens front surface and the lens rear surface of the optical unit.
- An optical surface that gives a cylindrical lens power for correction is set.
- the contact lens having the ability to suppress myopia progression when the wearing eye is an astigmatic eye, wearing it also exhibits an astigmatism correction effect, and can further improve the QOV in the wearing state.
- a ninth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to eighth aspects, wherein the central region is a central portion of the retina on the lens optical axis.
- the refractive correction power for providing appropriate visual acuity is set, and the addition power for focusing on the vicinity of the retina is set in the peripheral region.
- the contact lens having the ability to suppress myopia progression it is not necessary to excessively increase the addition power required for setting the focal position near the retina.
- the geometric center of the contact lens is aligned with the eye axis of the eye while the lens optical axis with an appropriate refractive correction power is set to the eye sighting axis.
- Cooperating with the positioning means in the circumferential direction while achieving a good QOV and an effect of suppressing myopia, while allowing a stable wearing state of the contact lens by allowing it to be worn out of position. obtain.
- a tenth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to eighth aspects, wherein the central region has a lens optical axis of the optical unit for far vision.
- a proper vision correction area with a substantially constant proper vision correction power is provided, and the peripheral area is under-adjusted on the lens optical axis of the optical unit for near vision Is provided with an under-adjustment compensation region in which a substantially constant under-adjustment compensation frequency that compensates for this is set as the addition power.
- the contact lens having the ability to suppress myopia progression it is necessary to excessively increase the addition power required to set an additional focus on the cornea side than the focus that is in an appropriate myopia correction state on the lens optical axis. Disappears.
- the geometric center of the contact lens is aligned with the eye axis of the eye while the lens optical axis with an appropriate refractive correction power is set to the eye sighting axis.
- An eleventh aspect of the present invention is the contact lens having the ability to suppress myopia progression according to the tenth aspect, wherein the under-adjustment compensation frequency is +0.5 to +0. It is set within the range of 75 diopters.
- the contact lens having the ability to suppress myopia progression according to this aspect is more suitable for obtaining an effective myopia suppression effect while maintaining a good QOV in a state where the lens optical axis is accurately aligned with the aiming axis of the eye.
- An under-adjustment compensation frequency can be set.
- an under-adjustment compensation frequency within the range of +0.5 to +0.75 diopter, it is possible to make the human eye under-adjusted in the adjustment lag theory when viewing near 40cm in front of the eye, which is frequently occurring in daily life. The resulting adjustment lag and the like can be effectively compensated.
- a twelfth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to the tenth or eleventh aspect, wherein the appropriate visual acuity correction region has a diameter centered on the lens optical axis of the optical unit. Is set to a size exceeding 0 mm and less than 5 mm.
- the optical axis of the lens is the aiming axis in consideration of the characteristic that light stimulation at the fovea located in the central portion on the retina is dominant for the vision of the human eye.
- an appropriate visual acuity correction area can be efficiently secured in an area of less than ⁇ 5 mm at the center.
- the appropriate visual acuity correction area exceeds ⁇ 5 mm, the under-adjustment compensation area provided on the outer periphery may not function stably in the wearing state.
- a thirteenth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the tenth to twelfth aspects, wherein the under-adjustment compensation region is a lens optical axis of the optical unit.
- the center is set with a ring having a predetermined width in the circumferential direction in a region having a diameter of 2 mm or more.
- the contact lens having the ability to suppress the progression of myopia in consideration of the situation of near vision such as reading indoors, when the average pupil diameter of the human eye is taken into account, the adjustment is insufficiently compensated in the region of ⁇ 2 mm or more.
- the myopia progression suppression function by compensating for the lack of adjustment in the near vision situation can be satisfactorily exhibited without significantly hindering the appearance by the appropriate vision correction region in the distance vision situation.
- a fourteenth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the first to thirteenth aspects, wherein the refractive correction power in the central region of the optical unit is mutually
- the diopter value of the refractive correction power in the central region of the optical unit is negative It is characterized in that the positive addition power in the peripheral region of the optical unit is set to be higher as the value increases.
- myopia and myopic astigmatism in the central region of the optical unit are considered in consideration of the tendency of the axial length to be extended and the flattening of the eyeball shape as the myopia progresses.
- the positive addition power in the peripheral region of the optical unit is specified as only one type corresponding to the diopter value of the refractive correction power in the central region of the optical unit. It is not prepared by the above method, but a plurality of types of addition powers can be combined and prepared. In that case, for example, the maximum value of the addition power and the average value of the addition power set in the peripheral area of the optical unit in response to the diopter value of the refractive correction power in the central region of the optical unit becoming higher on the negative side.
- a plurality of types of contact lenses having the ability to suppress the progression of myopia are combined so that becomes higher on the plus side.
- a fifteenth aspect of the present invention is a contact lens set having the ability to suppress myopia progression according to the fourteenth aspect, wherein the refractive correction power in the central region of the optical unit is -0.25 to-
- the contact having a plurality of types of optical characteristics, each set within a range of 10 diopters and an upper limit value of the addition power in the peripheral region of the optical unit within a range of +0.25 to less than +1.00 diopters It is comprised including a lens.
- a better myopia progression suppression effect is obtained as compared to the conventional myopia progression suppression contact lens in which a high addition power of about +2.0 diopters is generally set.
- Those that have a sufficiently low addition power within the range that can be selected will be selected and adopted for each patient, and a good QOV will be ensured when wearing a contact lens that has the ability to suppress myopia progression during treatment for myopia progression suppression. Can be done.
- a sixteenth aspect of the present invention is a contact lens having the ability to suppress myopia progression according to any one of the tenth to thirteenth aspects, wherein the appropriate visual acuity correction power in the appropriate visual acuity correction region of the optical unit is
- the value of the appropriate visual acuity correction power in the appropriate visual acuity correction region is concerned.
- the degree of under-adjustment compensation in the under-adjustment compensation region is set to a constant value within a range of +0.5 to +0.75 diopters with respect to the appropriate visual acuity correction degree.
- the contact lens set having the ability to suppress myopia progression of this aspect it is prepared by specifying only one type of underadjustment compensation frequency in the peripheral region of the optical part, regardless of the diopter value of the appropriate visual acuity correction power in the central region of the optical part. Is done. That is, in the contact lens according to the present invention, since the lens optical axis is aligned with the eye sighting axis in the wearing state, an appropriate vision correction state for far vision is stably expressed. As a result, the degree of under-adjustment compensation that can effectively compensate for the adjustment lag for near vision of about 40 cm, which is assumed in advance, is effectively set with a constant value within the range of +0.5 to +0.75 diopter. It becomes possible.
- the focal position in the periphery of the retina can be determined by reducing the amount of deviation between the sight line of the human eye and the lens optical axis in the wearing state. It is possible to uniformly set a position close to the lens, or to set an additional focus with an appropriate myopia correction power and an appropriate addition power on the lens optical axis. Therefore, it is possible to obtain the desired myopia progression suppression effect while ensuring a good QOV in the wearing state and reducing the burden on the wearer.
- FIG. 1 is a longitudinal cross-sectional explanatory view showing a wearing state of a contact lens having a structure according to the present invention and having a myopia progression suppressing ability to a human eye.
- 1 is a front view of a contact lens as a first embodiment of the present invention.
- III-III sectional view in FIG. It is a graph for demonstrating the addition power set to the optical part in the contact lens as 1st embodiment shown by FIG. 2, and the example (solid line) which changes steplessly, and the example which changes stepwise ( (Broken line).
- Front explanatory drawing which shows the wearing condition to the human eye of the contact lens of this embodiment.
- Example 1 is an explanatory diagram of a contact lens for suppressing myopia progression of a conventional structure
- Example 1 is an explanatory diagram of a contact lens having a myopia progression suppressing ability of the present embodiment.
- FIG. 1 It is longitudinal cross-sectional explanatory drawing for demonstrating the off-axis aberration theory as background art, Comprising: (a) is explanatory drawing of the focus position in a normal vision eye, (b) is the focus position in the myopic eye corrected with the single focus lens.
- FIG. 2 shows a front view of a contact lens 10 having a myopia progression suppressing ability to suppress the progression of myopia and myopic astigmatism as the first embodiment of the present invention
- FIG. A longitudinal sectional view of such a contact lens 10 is shown.
- the contact lens 10 as a whole has a substantially spherical crown shape, and is superimposed on the surface of the cornea 12 in the human eye 14 as shown in FIG. Being worn and used.
- the human eye 14 and the contact lens 10 in FIGS. 1, 2 and 8 are all contact lenses for the left eye and the left eye, and the left side in the figure is the nose side and the right side is the ear. Shown as side.
- the contact lens 10 having the ability to suppress myopia progression may be either a soft type or a hard type.
- the material is not limited.
- a contact lens having a soft type myopia progression suppressing ability in addition to a water-containing material such as a known PHEMA (polyhydroxyethyl methacrylate) or PVP (polyvinylpyrrolidone), an acrylic rubber, Non-hydrous materials such as silicone can also be used. It is also possible to adopt a material such as a gas permeable lens (RGP lens) such as PMMA (polymethylmethacrylate) or SiMA / MMA polymer to make a hard type contact lens having the ability to suppress myopia progression. .
- RGP lens gas permeable lens
- the contact lens 10 having the ability to suppress myopia progression has a circular shape in the front view shown in FIG. 2, and is substantially convex as shown in FIGS.
- the contact lens 10 is structurally structured such that an optical part 24 that extends in a substantially circular shape in front view in the central portion, and a peripheral part 26 that extends in a substantially annular shape in front view so as to surround the periphery of the optical part 24, It is comprised by the edge part 28 which is located in the outermost periphery part of a lens around the periphery part 26, and connects a lens front-back surface.
- the optical unit 24 is an optical region that is positioned on an optical path for projecting light incident through the pupil of the wearer onto the retina and exerts a predetermined refractive power on the incident light on the human eye 14. That is, the optical part 24 is formed with a size that can cover the wearer's pupil, and in general, when the enlarged pupil diameter in the human eye is taken into consideration, it can be formed with an outer diameter of 5 to 8 mm. desirable.
- the optical unit 24 is set with a refractive correction power for correcting myopia and myopic astigmatism and an addition power for suppressing myopia progression according to the optical characteristics of the eye optical system of the wearer.
- the optical unit 24 is set with a refractive correction power for correcting myopia and myopic astigmatism in the central region 32 having the optical axis center 30.
- the optical power of the optical unit 24 is a minus diopter lens for correcting myopia corresponding to the degree of myopia so as to eliminate myopic blurring with the naked eye. Is set as the spherical lens power.
- the refractive correction power in the central region 32 an appropriate visual acuity is given to the central portion of the retina on the lens optical axis 18 during far vision.
- an addition power for suppressing myopia progression is set in an annular peripheral region 34 located on the outer peripheral side of the central region 32 in the optical unit 24.
- the addition power is determined so that the focal position in the peripheral part of the retina is close to the retina on the retina or in front of the retina.
- the target eye of the myopia progression suppression treatment has a substantially oval shape in which the peripheral portion of the retina is flattened so as to extend in the axial direction. Therefore, the addition power of the peripheral region 34 corrects the hyperopic focus error.
- the addition power is set in the peripheral region 34 so that the focal point is provided at a position near the cornea 12 relative to the retina in the vicinity of the retina, that is, in the peripheral portion outside the lens optical axis 18.
- a maximum value of the addition power is preferably set within a diopter range of +0.25 to less than +1.00.
- the optical unit 24 is continuously stepless in the radial direction from the optical axis center 30 side that is the center of the optical unit 24 toward the peripheral region 34 that is the outer peripheral side.
- the changing addition power is set.
- a positive spherical aberration is given to the optical unit 24.
- the correction amount of the focus error increases toward the front side toward the outer peripheral side as compared with the focal position of the single focus lens having no addition power, and continuously from the center toward the outer periphery.
- the focal position can be accurately matched to the position of the retina that changes into an aspherical shape.
- an arbitrary outer diameter can be set according to the living environment and preferences of the wearer, the degree of addition power, and the like. For example, by setting the addition power gradually increasing toward the outer peripheral side starting from the optical axis center 30 of the optical unit 24, the central region 32 to which no addition power is added is formed only on the optical axis center 30. May be.
- annular maximum addition portion 36 having a maximum and constant addition power and extending in a predetermined radial direction is provided at the outermost peripheral portion in the peripheral region 34 of the optical portion 24. It may be done. By providing such a region with the maximum addition power in a predetermined area, tuning such as improving the visibility of an object in a specific distance region can be performed.
- the annular maximum joining portion 36 is desirably formed in a region of ⁇ 2 mm or more, and thereby the above-described focus error correction effect by the central region 32 can be ensured satisfactorily.
- the “radius of the optical part” on the vertical axis in FIG. 4 indicates the incident position of the light beam that focuses on the retina at a position off the center of the retina.
- the “lens power difference” on the horizontal axis in FIG. 4 is also a lens for the inclined light beam with reference to the lens power for the light beam on the lens central axis. It represents the difference in frequency.
- the setting mode of the addition power in the peripheral region 34 is not limited to the one that changes continuously and continuously from the center toward the outer periphery as described above.
- an area where the addition power changes may be provided between the stages of each addition power so as to smoothly connect the adjacent power additions. Even if the addition power is set stepwise in this way, the same effect as when set steplessly can be exhibited.
- the optical unit 24 including the central region 32 in which the spherical lens power is set and the peripheral region 34 in which the addition power is set as described above.
- a cylindrical lens power for correcting such astigmatism can be set. That is, the cylindrical lens power required to correct the astigmatism of the wearer is set for the optical unit 24 with a predetermined cylindrical axis angle.
- the optical surface that gives the spherical lens power, the addition power, and the cylindrical lens power as described above can be set to either the lens front surface 20 or the lens rear surface 22, and the lens front and back surfaces 20, It may be set so that predetermined optical characteristics are exhibited in cooperation with each other.
- one surface of the lens front surface 20 and the lens rear surface 22 of the optical unit 24 has a spherical shape with a radius of curvature considering the corneal curvature radius and the like, and the other surface requires a spherical lens power. Is a spherical shape with a radius of curvature. Furthermore, at least one of the front and rear surfaces 20 and 22 of the lens is added with an aspherical surface that gives an addition power, and a toric surface having a specific radial axis is added if necessary. Then, by forming the lens front surface 20 and the lens rear surface 22 on the same optical axis center 30, the optical unit 24 having the optical characteristics as described above can be realized.
- the peripheral portion 26 formed around the optical portion 24 is formed with the lens front and back surfaces 20 and 22 smoothly connected to the optical portion 24, but does not affect the optical characteristics of the eye optical system.
- the peripheral width of the peripheral portion 26 changes in the circumferential direction, and the radial width size changes continuously between the narrow width portion on the left side and the wide width portion on the right side in FIG. .
- the lens outer shape is defined by the edge portion 28 located at the outer peripheral edge portion of the peripheral portion 26, but the contact lens 10 having the myopia progression suppressing ability of the present embodiment has a lens geometry that is the center of the lens outer shape. It has a circular outer shape centered on the center 38.
- the optical axis center 30 of the optical unit 24 is shifted from the lens geometric center 38 by a predetermined amount of eccentricity: ⁇ ( ⁇ ⁇ 0). Note that the outer shape of the optical unit 24 does not need to have the optical axis center 30 as the geometric center, but in the present embodiment, the optical unit 24 is provided with a substantially circular outer shape with the optical axis center 30 as the center.
- the peripheral portion 26 is provided with positioning means for positioning the contact lens 10 in the circumferential direction in the worn state.
- the eccentricity of the optical axis center 30 of the optical portion 24 with respect to the lens geometric center 38 is provided.
- the direction is set to be substantially horizontal when worn. That is, the eccentric direction line 40 of the optical unit 24 shown in FIG. 2 is substantially horizontal, and orthogonal direction lines 42 and 44 extending perpendicularly to the eccentric direction line 40 through the lens geometric center 38 and the optical axis center 30 are provided.
- the contact lens 10 having the ability to suppress myopia progression according to the present embodiment is positioned in a worn state in a substantially vertical direction.
- the positioning means can be adopted as the positioning means.
- Specific examples include the “truncation method” disclosed in Japanese Utility Model Laid-Open No. 48-13048, the “prism ballast method” disclosed in Japanese Patent Laid-Open No. 11-258553, etc., and Japanese Patent Laid-Open No. 8-304745.
- the disclosed “slab-off method (double thin method)” is well known, and the “periballast method” disclosed in US Pat. No. 5,100,285 and the like can also be employed. That is, the “truncation method” is to position the contact lens in the circumferential direction by making the outer periphery of the lower end of the lens a linear shape in the chord direction and supporting it with the lower eyelid.
- the “prism ballast method” is a method of positioning a contact lens in the circumferential direction by using a gravitational action by setting a prism on the entire lens and increasing the thickness downward.
- a thin part is provided at the top and bottom of the lens, and the contact lens is positioned in the circumferential direction by using the eyelid action by the eyelids on the upper and lower parts of the lens and the eyelid pressure action on the inclined surfaces of the upper and lower parts of the lens.
- the “periballast method” a pair of thick portions are formed at positions deviated downward on the left and right sides of the lens periphery, and the contact lens is positioned in the circumferential direction using the weight balance of the pair of thick portions. Is.
- FIG. 2 shows an example in which circumferential positioning means by the slab-off method is applied to the contact lens 10 having the myopia progression suppressing ability. That is, a pair of upper and lower slab-off regions 46, 46 that are gradually thinner from the center toward both the upper and lower sides in the portion located on both the upper and lower sides of the optical unit 24 across the eccentric direction line 40 extending in the horizontal direction. Is formed. Note that the thin wall surface that provides the slab-off regions 46 and 46 can be formed on either one or both of the lens front and rear surfaces 20 and 22, and in this embodiment, shown in FIGS. Thus, it is formed only on the lens front surface 20.
- the pair of upper and lower slab-off regions 46 and 46 are formed with a line-symmetric shape with respect to the eccentric direction line 40. Accordingly, the contact lens 10 is positioned on the cornea 12 in a state where the eccentric direction line 40 is in a substantially horizontal direction and the orthogonal direction lines 42 and 44 are in a substantially vertical direction while being worn on the human eye 14. It has become so.
- the peripheral portion 26 is provided with a mark 48 that allows the circumferential position to be recognized visually.
- the mark 48 is formed with a recognizable structure such as marking or coloring provided in the peripheral portion 26, for example, and may constitute a character or a symbol. Since the position of the mark 48 on the circumference of the peripheral portion 26 is specified in advance, the relative deviation direction of the optical axis center 30 with respect to the lens geometric center 38 can be recognized based on the mark 48. ing.
- the mark 48 is attached to either side of the optical part 24 on the eccentric direction line 40 or the mark 48 is attached to any side of the optical part 24 on the orthogonal direction line 42. It is possible to recognize the eccentric direction of the optical axis center 30 based on the position of the mark 48.
- a colored circular mark 48 is provided on the side opposite to the eccentric side of the optical axis center 30 on the eccentric direction line 40.
- the contact lens 10 having the above-described structure and having the ability to suppress myopia progression can be formed by directly cutting a block preliminarily polymerized with an appropriate material, it has good mass productivity. In order to achieve excellent quality stability, it is desirable to manufacture by molding. Since any manufacturing method can be carried out by a known method, a detailed description is omitted.
- a female mold having a substantially concave spherical crown-shaped molding surface corresponding to the lens front surface 20 and a lens rear surface 22 are provided.
- the contact lens 10 having such a structure and having the ability to suppress myopia progression is worn by being superimposed on the surface of the cornea 12 of the human eye 14 as shown in FIG.
- the lens In such a wearing state, the lens is positioned in the circumferential direction by the positioning means including the slab-off regions 46 and 46 provided in the peripheral portion 26, and the eccentric direction of the optical axis center 30 with respect to the lens geometric center 38 is the horizontal direction.
- the contact lens 10 in such a wearing state is positioned right and left so that the eccentric direction of the optical axis center 30 is on the face center side that is the nose side of the wearer.
- This left-right positioning can be realized by setting the mark 48 on the peripheral portion 26 as a mark so that the mark 48 is set on the outer side of the face that is the ear side of the wearer.
- the circumferential position is maintained by the positioning means.
- the contact lens 10 having the ability to suppress myopia progressed in this way is in a state where the optical axis center 30 is deviated by an eccentric amount: ⁇ to the nose side with respect to the lens geometric center 38.
- ⁇ eccentric amount
- the amount of deviation of the lens optical axis 18 (optical axis center 30) with respect to the wearer's line of sight 16 is effectively suppressed.
- the contact lens 10 having the ability to suppress myopia that is worn on the human eye 14 has different curvature radii of the cornea 12 and the conjunctiva between the nose side and the ear side, Since the direction and distribution of pressure are different between the nose side and the ear side, it is easy to stabilize at a position shifted from the center of the cornea 12 to the ear side. Therefore, by setting the amount of eccentricity ⁇ of the optical axis center 30 corresponding to the amount of deviation between the pupil center and the lens geometric center 38 at this stable position, the optical axis center of the contact lens 10 under the wearing state is set. 30 will be positioned on the axis of the line of sight 16.
- FIG. 5 is a drawing-substituting photograph.
- the outer edge and the optical axis of the edge portion 28 and the optical portion 24 of the contact lens 10 are shown.
- the outer edge and the like of the central region 32 where the center 30 is set are represented by lines that are emphasized in the drawing.
- the contact lens 10 is generally worn and used in the left and right eyes of the wearer, but only the left eye is shown in FIG. In the right eye, the contact lens 10 is worn while being rotated 180 degrees from FIG. 5, so that the eccentric direction of the optical axis center 30 is aligned in the circumferential direction with the nose side being used.
- the optical axis center 30 is positioned on the axis of the sight line 16 of the right eye.
- the contact lens 10 having the ability to suppress myopia progression as shown in FIG. 1, even when the stable position of the contact lens 10 on the cornea 12 is biased toward the ear, The amount of deviation between the sight line 16 of the eye 14 and the lens optical axis 18 (optical axis center 30) can be reduced.
- the addition power can be set low, and asymmetric high-order aberrations such as coma aberration can be reduced. It becomes possible to suppress. Therefore, the quality of appearance (QOV) of the contact lens 10 having the ability to suppress myopia progression under the wearing state can be maintained as good as that of a normal contact lens for refractive correction, which greatly burdens the wearer. Thus, it is possible to obtain the target myopia progression suppression effect while alleviating.
- QOV quality of appearance
- the contact lens 10 having a structure according to the present invention has an effective ability to suppress myopia progression and also has a good QOV. Therefore, the use of the contact lens according to the present invention is not limited to the suppression of myopia progression, for example, for refractive correction that corrects general myopia and myopic astigmatism not intended for suppression of myopia progression. It can also be used as a contact lens.
- the specific configuration of the contact lens having the ability to suppress myopia progression considering the off-axis aberration theory is exemplified as the contact lens 10 according to the first embodiment, but the present invention is a myopia progression considering the adjustment lag theory.
- the present invention can also be applied to a contact lens having suppression ability, and its specific configuration will be exemplified as a second embodiment below.
- parts that are substantially the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.
- the basic structure of the contact lens of this embodiment is the same as that of the first embodiment.
- the contact lens is formed with a basic shape as shown in FIGS. 2 and 3 and an optical center deviated from the lens geometric center.
- the optical part and the positioning means in the circumferential direction in the worn state are provided in the same manner as the contact lens 10 of the first embodiment.
- the contact lens 50 of the present embodiment has an optical characteristic different from that of the first embodiment. Specifically, as illustrated in FIG. 7, in the central region 32 that gives the correction power for far vision, the central portion on the lens optical axis 18 has a certain appropriateness that gives appropriate visual acuity for far vision.
- An appropriate visual acuity correction region 52 in which the visual acuity correction frequency is set is provided. Note that the appropriate visual acuity correction power is obtained by correcting the position of the focal point on the optical axis in the broken line indicating the optical characteristics in the naked eye of the myopic eye in FIG. This is the lens power necessary to achieve the correct state.
- the appropriate visual acuity correction region 52 can be set to an appropriate size in consideration of the living environment of the wearer and the naked eye visual acuity, and preferably has a diameter of 0 mm around the lens optical axis 18 of the optical unit 24. It is set with a size exceeding 5 mm.
- the appropriate visual acuity correction area By forming the appropriate visual acuity correction area with a diameter exceeding ⁇ 0 mm, the visual acuity correction effect by the appropriate visual acuity correction area is advantageously exhibited.
- it is desirable that the proper visual acuity correction region is formed with a diameter of less than ⁇ 5 mm, thereby avoiding excessively hindering the appearance during far vision.
- the lens power set in the appropriate visual acuity correction region 52 only needs to be substantially constant, and the power change of the degree of spherical aberration appearing in the single focus lens can be sufficiently tolerated with no adverse optical effect.
- the focal point on the lens optical axis 18 is positioned on the retina.
- the naked eye focus indicated by a broken line in FIG. 6 is corrected to the position of the appropriate correction focus on the retina as indicated by the solid line in FIG.
- a viewing state of 40 cm in front of the near eye assuming reading such as near vision as shown by a two-dot chain line in FIG. Focus on 18 behind the retina.
- the focal point behind the retina is adjusted to the position of the retina by the adjustment ability left in the wearing eye, so that a clear visual state is obtained.
- the adjustment of the focal position of the eye during near vision is generally adjusted by an amount that does not reach the proper position (adjustment lag theory), as shown by a two-dot chain line in FIG. On 18, it does not reach the retina, but stops to place the focal point behind the retina.
- This is called an “adjustment lag” and an adjustment deficiency of 0.50 to 0.75 diopters on average is recognized in young people aged 20 to 25 years with respect to an adjustment stimulus set with an index of 40 cm in front of the eyes.
- the lack of adjustment of the human eye during near vision is considered to be a cause of myopia progression due to the growth of the axial length.
- the peripheral region 34 of the optical unit 24 has a substantially constant under-adjustment compensation frequency that compensates for under-adjustment during near vision.
- a set underadjustment area 54 is provided.
- the underadjustment compensation frequency in FIG. 6 refers to an overcorrected focus appearing in near vision under an appropriate visual acuity correction state with an appropriate visual acuity correction power set in the central region 32 of the contact lens 50 in FIG. The lens power necessary to achieve an appropriate correction state even in near vision by setting the focal point in the approximate central fovea on the retina by compensating for the lack of adjustment by an amount corresponding to.
- the underadjustment compensation region 54 can be set in an appropriate size in consideration of the wearer's living environment and the like, and preferably in a region having a diameter of 2 mm or more around the lens optical axis 18 of the optical unit 24. , And set in an annular shape with a radial width dimension of 0.10 mm or more.
- the lens power set in the under-adjustment compensation region 54 may be substantially constant, and the power change of the degree of spherical aberration appearing in the single focus lens can be sufficiently tolerated with no optical adverse effect.
- a transition region 56 is set between the outer peripheral side of the appropriate vision correction region 52 in the central region 32 and the under-adjustment compensation region 54 in the peripheral region 34.
- the transition region 56 extends between both the central region 32 and the peripheral region 34, and is formed with a lens power that gradually changes from an appropriate visual acuity correction power to an underadjustment compensation power.
- a transition area 56 is not essential, the provision of the transition area 56 achieves effects such as an increase in depth of focus and an improvement in QOV by preventing defects such as image jumps as described in the first embodiment. Is done.
- the contact lens 50 has a far vision focal point with an appropriate visual acuity correction state when setting the focal position on the lens optical axis and the eye sighting axis.
- the focal position on the optical axis in near vision is +0.5 so that the lack of adjustment is compensated for the adjustment stimulus in the near vision of about 40 cm in front of the eyes while reading, etc. while securing visual acuity during outdoor activities. It is set in front of the diopter.
- the proper vision correction region 52 that gives the proper vision to the central region 32 in consideration of the far vision in the outdoors is provided, so that the far vision can be obtained even when the pupil is small such as daytime activity. The focus is clearly obtained.
- the peripheral region 34 is compensated for the lack of adjustment during near vision and the focus is not excessively corrected for myopia.
- the under-adjustment compensation region 54 is given as a certain additional power region that is a plus diopter compared to the appropriate vision correction power.
- the contact lens 50 according to the present embodiment is a novel lens in consideration of the living conditions of modern children and adolescents who often have near vision by adjusting the focal position on the optical axis during near vision.
- the myopia suppression theory has been established, and its effect has been confirmed as shown in the following examples.
- FIG. 8 shows + 0.25D and + 0.50D of the contact lens (Example 1) having the ability to suppress myopia progression of the structure according to the second embodiment in which the addition power of + 0.5D is set in the under-adjustment compensation region.
- the appearance of the Landolt ring when a focus error occurs is displayed as a simulation result of the retinal optical image.
- Comparative Example 1 is a contact lens for suppressing myopia progression in which the same addition power is set, and the center of the optical axis is not set eccentric and the line of sight and the optical axis of the lens are shifted by 0.5 mm. Is also shown in FIG. For obtaining these simulation results, optical design software ZEMAX Engineering Edition manufactured by ZEMAX Development Corporation was used.
- [Table 1] shows myopia in the contact lens (Example 2) having the myopia progression suppressing ability of the structure according to the second embodiment and the conventional contact lens for suppressing myopia progression (Comparative Examples 2 and 3).
- the result of the effect test of the progress inhibition effect is shown.
- the test results of Comparative Example 2 are based on Non-Patent Document 1 “Investigative Ophthalmology & Visual Science, 2011; 52: 9362-9367” by Sankaridur et al.
- the test result of Comparative Example 3 is based on Non-Patent Document 2 “Ophthalmology, 2011; 118: 1152-1116” by Antisice et al.
- the amount of change in the axial length and the amount of change in the refractive power (objective refraction value) of each of the subject wearing the test lens and the subject wearing the control lens were measured. That is, first, before the test, the length of the eye axis and the refractive power of the eye of each subject were measured with a light interference type eye axis length measuring device, a wavefront sensor, or a binocular open autorefractometer. Thereafter, each subject wore a test lens or a control lens for a predetermined period, and again measured the length of the axial axis and the refractive power of the eye after the test period. In this way, the amount of change in the length of the eye axis and the amount of change in the refractive power of the eye before and after the test period were calculated. In this effect test, children aged 7 to 16 years were targeted.
- Example 2 In each of the effect tests of Example 2 and Comparative Examples 2 and 3, the optical interference type axial length measuring device, wavefront sensor, or binocular open autorefractor used for measuring the axial length and optical refractive power of the eye. The following equipment was used for the meter.
- Example 2 ⁇ Axial length measurement "IOLMaster by Carl Zeiss” ⁇ Refractive power measurement "KR-9000PW manufactured by Topcon Corporation” [Comparative Example 2] ⁇ Axial length measurement "IOLMaster by Carl Zeiss” ⁇ Refractive power measurement "SHIN-NIPPON NVision-K5001 made by Rexam Co., Ltd.” [Comparative Example 3] ⁇ Axial length measurement "IOLMaster by Carl Zeiss” ⁇ Refractive power measurement "HARK-599 made by Carl Zeiss”
- the test lens of Example 2 is a contact lens having a myopia progression suppressing capability with the structure according to the second embodiment, and the underadjustment compensation power that is the maximum addition power of the test lens is + 0.5D.
- the test lenses of Comparative Examples 2 and 3 are contact lenses for suppressing myopia progression having a conventional structure.
- the test lens of Comparative Example 2 has a region for correcting refractive error at the center, and has a region where the addition power is gradually increased to +2.0 D on the outer periphery of the center region.
- test lens of Comparative Example 3 has a correction region (C1) for correcting refractive error at the center, and correction with regions (T1, T2) having an addition power of + 2.0D on the outer periphery of the central region. Regions (C2, C3) are alternately provided (see Non-Patent Document 2 FIG. 1.A).
- Example 2 and Comparative Examples 2 and 3 After this test, for each of Example 2 and Comparative Examples 2 and 3, the average values of the change in the axial length and the change in the refractive power of the eye were calculated, and the inhibition rate (((change in control lens Amount ⁇ change amount of test lens) / change amount of control lens) ⁇ 100).
- the maximum addition power of the test lens of Example 2 is + 0.5D
- the maximum addition power of the test lenses of Comparative Examples 2 and 3 is both + 2.0D.
- the contact lens having the ability to suppress myopia progression of the structure according to the second embodiment is equivalent to the contact lens for suppressing myopia progression of the conventional structure while suppressing the addition power than the contact lens for suppressing myopia progress of the conventional structure. It was confirmed that the effect of suppressing myopia progression was obtained.
- +0.50 to 0.75 diopter as the under-adjustment compensation power is the contact lens having the structure according to the second embodiment as in the test lens of Example 2, and the maximum addition power.
- the contact lens lenses of Examples 3 to 5 where + 0.50D, + 0.75D, and + 1.0D are set as the degree of underadjustment compensation the compensation situation of underadjustment is subjectively measured, and distance vision and near.
- N.S. represents “a measurement result in which no statistically significant difference was observed as compared with a single focus contact lens used as a control lens”.
- ⁇ represents “measurement results that are inferior in statistical significance compared to the single focus contact lens used as a control lens”
- ⁇ represents “comparison with a single focus contact lens used as a control lens”. Represents a measurement result superior to statistical significance.
- “2 Week Accuview” (registered trademark) manufactured by Johnson & Johnson Co., Ltd. was employed as a single focus contact lens as a control lens.
- this experiment was implemented for 22 persons and 44 eyes.
- “CL corrected visual acuity” indicates a comparison of visual acuity when wearing the contact lenses of Examples 3 to 5 and the single focus contact lens as a reference lens.
- “Compensation” is a comparison between the case of wearing the contact lenses of Examples 3 to 5 and the case where the clear vision area toward the near vision side is enlarged compared to the case of wearing a single focus contact lens as a control lens. It is.
- “Visibility of visibility” is a comparison of whether or not an image can be seen without blur when the contact lenses of Examples 3 to 5 and the single focus contact lens as a control lens are respectively worn.
- the “contrast sensitivity” means that the contact lens of Examples 3 to 5 and the single focus contact lens as the reference lens are respectively worn, and an image with a contrast of 100% and an image with a contrast of 10% are arranged at a predetermined distance. This is a comparison of how it looks when viewed.
- the outer shape of the optical part and the lens outer shape employed in the contact lens according to the present invention do not have to be circular as described in the embodiment, and for example, an elliptical shape can also be employed.
- the contact lens according to the present invention is provided to the market as a series by combining a plurality of types in which various setting values are changed and set at appropriate intervals.
- a plurality of types of optical characteristics in which different values are set as refractive correction powers for correcting myopia and myopic astigmatism set in the optical unit 24 can be combined with each other and provided to the market as a contact lens set having myopia progression suppression ability.
- the magnitude of the addition power set in the optical unit 24 is also a plurality of types of optical characteristics in which different values are set as the addition power set in the optical unit 24 in order to correspond to the retinal shape and the like for each wearer. It is necessary to provide what has
- the degree of addition power required tends to differ depending on the magnitude of the refractive correction power.
- the higher the diopter value of refractive correction power is on the negative side the higher the required diopter value of addition power is on the positive side. Therefore, the higher the diopter value of the refractive correction power is on the negative side, the higher the diopter value of the addition power is on the positive side.
- the refractive correction power is in the range of ⁇ 0.25 to ⁇ 10 diopters, and the maximum value of the addition power is +0.25 to +1. It is more efficient to provide a contact lens set having a myopia progression suppressing ability by combining at least a plurality of types of contact lenses that are set in a diopter range of less than 0.00 and have a plurality of types of optical characteristics. Is.
- a short distance of a specific distance on the basis of a state corrected to give appropriate visual acuity in distance vision is set. Since the degree of under-adjustment compensation for square vision is set, the required addition power is set to be approximately constant regardless of the appropriate visual correction power set in the appropriate visual correction area. Can be done. In general, the distance for near vision is set to about 40 cm in consideration of the living environment of the wearer, etc., so the degree of insufficient adjustment compensation is +0.5 to +0.75 diopters with respect to the appropriate vision correction degree. It is set within the range, and more preferably, a constant under-adjustment compensation power is set regardless of the magnitude of the appropriate visual acuity correction power.
- the appropriate visual acuity correction power set in the appropriate visual acuity correction region is used in combination with different values
- the under-adjustment compensation frequency set in the under-adjustment compensation area in the lens of the lens is constant within the range of +0.5 to +0.75 diopter with respect to each appropriate visual acuity correction power regardless of the value of each appropriate visual acuity correction power It is more efficient that the value is set.
- the contact lens having the ability to suppress myopia progression according to the present invention can be used even if the lens optical axis 18 (optical axis center 30) does not completely coincide with the line of sight 16 of the human eye 14 when worn.
- the amount of deviation between the line of sight 16 of the human eye 14 and the lens optical axis 18 (optical axis center 30) is sufficiently small, and the deviation is preferably 0.5 mm or less.
- the amount is limited.
- the lens has a plurality of types of myopia progression suppression ability in which the amount of eccentricity ⁇ of the optical axis center 30 with respect to the lens geometric center 38 is set to a different value.
- Contact lenses can also be included in the series and offered to the market.
- the eccentric direction of the optical axis center 30 of the optical unit 24 with respect to the lens geometric center 38 is substantially horizontal in the worn state, but this is not necessarily required.
- the lens optical axis 18 (optical axis center 30) of the optical unit 24 may be deviated with respect to the lens geometric center 38 so as to coincide with the line of sight 16 of the human eye 14.
- the 24 optical axis centers 30 may deviate from a horizontal straight line passing through the lens geometric center 38.
- the eccentric direction line 40 does not need to extend horizontally in the worn state, and may be inclined with respect to the horizontal axis.
- Such an inclination angle may be set according to, for example, the corneal shape or the lens stable position for each wearer, or may be set based on the average of the corneal shape or the lens stable position among a plurality of wearers.
- the mark 48 is provided on the eccentric direction line 40 or the orthogonal direction line 42.
- the mark 48 is not necessarily required, and a specific circumference corresponding to the eccentric direction of the optical axis center 30 in the contact lens 10 is not necessarily required. If the direction position can be determined, the mark 48 may be off the eccentric direction line 40 or the orthogonal direction line 42.
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Abstract
Description
[実施例2]
・眼軸長測定 「Carl Zeiss社製 IOLMaster」
・屈折力測定 「株式会社トプコン社製 KR-9000PW」
[比較例2]
・眼軸長測定 「Carl Zeiss社製 IOLMaster」
・屈折力測定 「株式会社レクザム製 SHIN-NIPPON NVision-K5001」
[比較例3]
・眼軸長測定 「Carl Zeiss社製 IOLMaster」
・屈折力測定 「Carl Zeiss社製 HARK-599」
Claims (16)
- 光学部の中央領域に近視および近視性乱視を矯正する屈折矯正度数が設定されているコンタクトレンズにおいて、
前記中央領域の前記屈折矯正度数以上に近視および近視性乱視が進行するのを抑制するように、前記光学部の周辺領域には遠視性の焦点誤差を補正するために該中央領域に比してプラスの加入度数が設定されており、且つ、
装用状態で周方向位置を特定するための位置決め手段が設けられていると共に、該位置決め手段による装用状態で前記光学部のレンズ光軸が、人眼の照準線と一致するように偏倚して設定されていることを特徴とする、近視進行抑制能を有するコンタクトレンズ。 - 前記光学部の前記周辺領域に設定される前記加入度数の最大値が、+0.25~+1.00ディオプター未満の範囲内である請求項1に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記周辺領域に設定される前記加入度数により該光学部に対して正の球面収差が付与されていると共に、前記位置決め手段と前記光学部のレンズ光軸の偏倚構造とにより装用状態で該光学部のレンズ光軸が前記人眼の照準線と一致するように偏倚設定されていることにより、コマ収差等の非対称な高次収差の増加に伴う自覚的QOVの低下を招くことなく焦点深度が増大されている請求項1又は2に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記周辺領域における前記加入度数が、該光学部の中央側から外周側に向かって無段階で漸次変化して焦点誤差の補正量が大きくなるように設定されている請求項1~3の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記周辺領域における前記加入度数が、該光学部の中央側から外周側に向かって無段階で漸次変化して焦点誤差の補正量が大きくなるように設定されていると共に、該光学部の該周辺領域における最外周部分には、最大で且つ一定の加入度数の領域が所定幅で環状に設けられている請求項4に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記周辺領域における前記加入度数が、該光学部の中央側から外周側に向かって段階的に変化して焦点誤差の補正量が大きくなるように設定されている請求項1~3の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記周辺領域における前記加入度数を与える光学面が、レンズ前面とレンズ後面との少なくとも一方に設定されている請求項1~6の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記光学部の前記レンズ前面と前記レンズ後面との少なくとも一方に乱視矯正用の円柱レンズ度数を与える光学面が設定されている請求項1~7の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記中央領域には、レンズ光軸上となる網膜の中心部分で適正視力を与える前記屈折矯正度数が設定されていると共に、
前記周辺領域には、網膜付近に焦点を与える前記加入度数が設定されている
請求項1~8の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。 - 前記中央領域には、遠方視に際して前記光学部のレンズ光軸上で適正視力を与える実質的に一定の適正視力矯正度数が設定された適正視力矯正領域が設けられていると共に、
前記周辺領域には、近方視に際して前記光学部のレンズ光軸上で調節不足を補填する実質的に一定の調節不足補填度数が前記加入度数として設定された調節不足補填領域が設けられている
請求項1~8の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。 - 前記調節不足補填度数が、前記適正視力矯正度数に対して+0.5~+0.75ディオプターの範囲内である請求項10に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記適正視力矯正領域が、前記光学部のレンズ光軸を中心として直径が0mmを越え且つ5mm未満の大きさで設定されている請求項10又は11に記載の近視進行抑制能を有するコンタクトレンズ。
- 前記調節不足補填領域が、前記光学部のレンズ光軸を中心として直径が2mm以上の領域で周方向に所定幅の環状をもって設定されている請求項10~12の何れか1項に記載の近視進行抑制能を有するコンタクトレンズ。
- 請求項1~13の何れか1項に記載の近視進行抑制能を有するコンタクトレンズであって、前記光学部の前記中央領域における前記屈折矯正度数として相互に異なる値が設定された複数種類の光学特性を有する該コンタクトレンズを、互いに組み合わせた近視進行抑制能を有するコンタクトレンズセットにおいて、
前記光学部の前記中央領域における前記屈折矯正度数のディオプター値がマイナス側に高い程、該光学部の前記周辺領域におけるプラスの加入度数が高くなるように設定されていることを特徴とする近視進行抑制能を有するコンタクトレンズセット。 - 前記光学部の前記中央領域における前記屈折矯正度数が-0.25~-10ディオプターの範囲で、且つ、該光学部の前記周辺領域における前記加入度数の上限値が+0.25~+1.00ディオプター未満の範囲に、それぞれ設定されたものの複数種類の光学特性を有する前記コンタクトレンズを含んで構成されている請求項14に記載の近視進行抑制能を有するコンタクトレンズセット。
- 請求項10~13の何れか1項に記載の近視進行抑制能を有するコンタクトレンズであって、前記光学部の前記適正視力矯正領域における前記適正視力矯正度数として相互に異なる値が設定された複数種類の光学特性を有する該コンタクトレンズを、互いに組み合わせた近視進行抑制能を有するコンタクトレンズセットにおいて、
前記適正視力矯正領域における前記適正視力矯正度数の値に拘わらず、前記調節不足補填領域における前記調節不足補填度数が、該適正視力矯正度数に対して+0.5~+0.75ディオプターの範囲内で一定の値に設定されていることを特徴とする近視進行抑制能を有するコンタクトレンズセット。
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US11733545B2 (en) | 2019-09-16 | 2023-08-22 | Acucela Inc. | Assembly process for an electronic soft contact lens designed to inhibit progression of myopia |
US11777340B2 (en) | 2020-02-21 | 2023-10-03 | Acucela Inc. | Charging case for electronic contact lens |
US11971615B2 (en) | 2020-05-13 | 2024-04-30 | Acucela Inc. | Electro-switchable spectacles for myopia treatment |
US11719957B2 (en) | 2020-06-08 | 2023-08-08 | Acucela Inc. | Stick on devices using peripheral defocus to treat progressive refractive error |
US11693259B2 (en) | 2020-06-10 | 2023-07-04 | Acucela Inc. | Methods for the treatment of refractive error using active stimulation |
US11860454B2 (en) | 2021-05-04 | 2024-01-02 | Acucela Inc. | Electronic case for electronic spectacles |
Also Published As
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EP2902839A1 (en) | 2015-08-05 |
JP5923614B2 (ja) | 2016-05-24 |
US20150219926A1 (en) | 2015-08-06 |
EP2902839A4 (en) | 2016-05-25 |
US9594258B2 (en) | 2017-03-14 |
JPWO2014050879A1 (ja) | 2016-08-22 |
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