Classifications

• • 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
  • G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures
• • 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
  • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
• • 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
  • G02C7/024—Methods of designing ophthalmic lenses
• • 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

• This disclosure relates to eyeglass lenses and methods for designing eyeglass lenses.
• Patent Document 1 describes a method of reducing contrast at any spatial frequency by Zernike aberration control.
• Patent Document 2 describes a configuration in which contrast at any spatial frequency is reduced by scattering light using protrusions (dot patterns) with a diameter of about 0.3 mm.
• any eyeglass lens that inhibits or reduces the progression of refractive errors should not only be able to inhibit or reduce the progression of said refractive errors, but it is also preferable that the eyeglass wearer does not feel uncomfortable when wearing the lens.
• the technology disclosed in Patent Document 1 is not designed to provide a function that takes into account eye rotation, which is a problem specific to eyeglasses, and so eyeglass wearers may feel uncomfortable in this respect.
• the lens's external appearance appears white and flickering due to light scattering, which is not aesthetically pleasing when worn, and so there is a risk that eyeglass wearers may feel uncomfortable in this respect.
• One aspect of the present disclosure provides technology related to eyeglass lenses that enable the suppression or mitigation of the progression of refractive errors while allowing the eyeglass wearer to wear the eyeglasses without feeling uncomfortable.
• a first aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: A clear area located so as to include the center of the lens; a defocus area located around the clear area, the clear area is configured as a single focal surface to which a prescribed power is imparted so that a light beam incident from a surface on the object side is emitted from a surface on the eyeball side and focused on a retina of the eyeball of the eyeglass wearer, the defocus area has a plurality of segment areas to which a power different from the prescribed power is imparted so that a light beam incident from a surface on the object side is emitted from a surface on the eyeball side to be focused at a position different from a retina of the eyeball of the eyeglass wearer,
• the spectacle lens has an area ratio of the non-segment region to a combined area of the plurality of segment regions in the defocus region and a non-segment region other than the segment regions, which is equal to or greater than 0% and equal to or less than
• a second aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the first aspect, wherein the plurality of segment regions are arranged with a periodicity.
• a third aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: the plurality of segment areas are arranged such that the centers of the respective segment areas are located at the vertices of triangles constituting a triangular lattice;
• the plane size d on the lens when the segment region exists alone is in the range of 0.25 mm to 2.0 mm,
• the arrangement interval p between adjacent ones of the plurality of segment regions is in the range of 0.25 mm or more and 2.0 mm or less,
• the spectacle lens according to the second aspect wherein the planar size d and the arrangement interval p satisfy the relationship 0.866 ⁇ p/d ⁇ 1.1.
• a fourth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the second or third aspect, wherein the adjacent segment regions are arranged so as to be in contact with each other.
• a fifth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the first aspect, wherein the segment area has a convex portion having a positive defocus power with respect to the prescription power so as to focus a light beam at a position closer to the object side than on the retina.
• a sixth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the first aspect, wherein the segment area has a concave portion having a negative defocus power with respect to the prescription power so as to focus a light beam at a position farther from the object side than on the retina.
• a seventh aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: In the eyeglass lens according to the fifth or sixth aspect, the non-segment area is formed into a curved shape having a defocus power of a different sign from that of the segment area.
• An eighth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: In the eyeglass lens according to the seventh aspect, a first derivative is continuous in the vicinity of the boundary between the segment region and the non-segment region.
• a ninth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: the segment region is a region formed by a convex closed curve, The spectacle lens according to the first aspect, wherein the non-segment region is a region formed by a non-convex closed curve.
• a tenth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The eyeglass lens according to the first aspect further comprises an optical film covering the plurality of segment regions.
• An eleventh aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: In the eyeglass lens according to the first aspect, the defocus area is annular with an inner diameter of 6 mm or more and 12 mm or less and an outer diameter of 40 mm or more.
• a twelfth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the eleventh aspect, wherein the segmented regions are arranged such that the area ratios of the non-segmented regions are different within the defocus region.
• a thirteenth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the eleventh or twelfth aspect, wherein five or more of the segment regions are included within a range of a predetermined diameter corresponding to a pupil diameter at an arbitrary position within the defocus region.
• a fourteenth aspect of the present disclosure is a method for manufacturing a semiconductor device comprising: a first step of designing one of the object-side and eyeball-side optical surfaces so that a clear area configured as a single focal surface to which a prescribed power is imparted so that a light beam incident from the object-side surface is emitted from the eyeball-side surface and focused on the retina of the eyeball of the eyeglass wearer is located at a position including the lens center; a second step of designing the optical surface so that a defocus area having a plurality of segment areas to which a power different from the prescribed power is assigned is disposed around the clear area so that a light beam incident from an object side surface is emitted from an eyeball side surface to focus the light beam at a position different from the retina of the eyeball of the eyeglass wearer, In the second step, the method for designing a spectacle lens is designed so that an area ratio of the non-segment regions to a combined area of the plurality of segment regions in the defocus region and non-seg
• FIG. 1 is an explanatory diagram showing an example of a planar configuration of a spectacle lens according to an embodiment of the present disclosure.
• FIG. 1 is an explanatory diagram showing an example of a cross-sectional configuration of a spectacle lens according to an embodiment of the present disclosure.
• 1 is an explanatory diagram showing an example of the arrangement of segment regions of a spectacle lens according to an embodiment of the present disclosure.
• 11 is an explanatory diagram showing another example of the arrangement of segment regions of a spectacle lens according to an embodiment of the present disclosure.
• 1 is an explanatory diagram showing an example of a cross-sectional configuration of a non-segment region of a spectacle lens according to an embodiment of the present disclosure.
• FIG. 1 is an explanatory diagram (part 1) showing a specific example of optical characteristics of a spectacle lens according to an embodiment of the present disclosure.
• FIG. 2 is an explanatory diagram (part 2) showing a specific example of optical characteristics of a spectacle lens according to an embodiment of the present disclosure.
• FIG. 3 is an explanatory diagram (part 3) showing a specific example of optical characteristics of a spectacle lens according to an embodiment of the present disclosure.
• 1 is an explanatory diagram showing a specific example of a design procedure for a segment region of a spectacle lens according to an embodiment of the present disclosure.
• FIG. 1 is an explanatory diagram showing an example of the planar configuration of a spectacle lens according to one embodiment.
• FIG. 2 is an explanatory diagram showing an example of the cross-sectional configuration of the spectacle lens.
• the spectacle lenses given as examples in this specification have an object-side surface and an eyeball-side surface.
• the "object-side surface” is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens
• the "eyeball-side surface” is the opposite, i.e., the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens.
• This relationship also applies to the lens substrate that forms the basis of the spectacle lens.
• the lens substrate also has an object-side surface and an eyeball-side surface.
• the horizontal direction when the eyeglass lens is worn is defined as the X direction
• the top-bottom direction is defined as the Y direction
• the thickness direction of the eyeglass lens which is perpendicular to the X and Y directions is defined as the Z direction.
• the Z direction is also the optical axis direction of the eyeglass lens.
• the origin is the lens center.
• the "lens center” refers to the optical center or geometric center of the eyeglass lens. In this specification, the optical center and the geometric center are approximately the same as each other.
• the “geometric center” refers to the center of a circle in the case of a circular shape in a planar view, such as an uncut lens before shaping, and refers to the center of gravity in a planar view in the case of other shapes. Facing the wearer, the right is the +X direction, the left is the -X direction, the top is the +Y direction, the bottom is the -Y direction, the object side is the +Z direction, and the opposite direction (the rear direction) is the -Z direction.
• plane view refers to the state when viewed from the +Z direction to the -Z direction.
• Each drawing in the present application illustrates a right-eye lens as viewed in plan, with the nose side direction being the +X direction and the ear side direction being the -X direction when the right-eye lens is worn.
• positions such as the eye point and geometric center of a spectacle lens, they refer to positions in a planar view unless otherwise specified.
• the eyeglass lens 10 when viewed in a plan view, has at least a clear region 11 located so as to include the lens center, and a defocus region 12 located around the clear region 11.
• the eyeglass lens 10 may also have a second clear region 13 around the defocus region 12.
• the clear area 11 is a portion having a smooth surface shape that can realize the wearer's prescribed refractive power from a geometrical optics perspective, and is, for example, a portion that is transparent in the visible light wavelength range.
• the clear area 11 is configured to allow a light beam incident from the surface on the object side to exit from the surface on the eyeball side, enter the pupil of the wearer's eyeball, and be focused on the retina of the eyeball.
• the clear area 11 is configured as an area including the lens center and/or the eye point.
• the "eye point (EP)" is, for example, the position through which the line of sight passes when the eyeglass lens is worn and the wearer faces straight ahead, and this example will be given below.
• the eye point may be the position through which the wearer's line of sight passes when viewing an object close to the wearer (in other words, when viewing close up), that is, the near vision eye point.
• the geometric center of the eyeglass lens before framing into the frame coincides with the eye point, coincides with the prism reference point, and coincides with the lens center.
• an eyeglass lens before framing into the frame is exemplified as an eyeglass lens of one aspect of the present disclosure, but the present disclosure is not limited to this aspect.
• the eye point can be identified by referring to a remark chart or centration chart issued by the lens manufacturer.
• the clear area 11 allows the prescription power (spherical power, cylindrical power, cylindrical axis, etc.) of the eyeglass lens 10 to be realized.
• the spherical power may be the power to be corrected when looking straight ahead (distance from the object is infinity to about 1 m) (for example, distance power; hereafter, distance power will be exemplified), or it may be the power to be corrected when looking at intermediate distances (1 m to 40 cm) or near distances (40 cm to 10 cm).
• the clear area 11 is an area for achieving the eyeglass wearer's prescribed power in order to focus the light beam on the retina, and is configured as a single focal plane to which the prescribed power is imparted.
• the prescription data of the wearer's information is written on the lens bag of the eyeglass lens.
• eyeglass lenses usually come in a set with a lens bag. Therefore, eyeglass lenses that come with a lens bag also reflect the technical ideas of this disclosure, and the same applies to sets of lens bags and eyeglass lenses.
• the clear area 11 is formed, for example, in a circular shape when viewed from above.
• the size of the clear area 11 is preferably, for example, an outer diameter of 6 mm or more and 12 mm or less.
• the clear area 11 may be disposed so as to be offset toward the nose of the spectacle wearer with respect to the lens center and/or eye point, taking into account the convergence of the eyes of the spectacle wearer.
• the second clear area 13 is also configured in the same manner as the clear area 11, except that it includes the lens center and/or the eye point.
• the clear area 11 and the second clear area 13 as described above function as a so-called fixed focal length lens.
• the defocus area 12 is a circular area arranged to surround the clear area 11. If the eyeglass lens 10 is provided with the second clear area 13, the defocus area 12 will be positioned so as to be sandwiched between the clear area 11 and the second clear area 13. In that case, it is preferable that the defocus area 12 is a circular area with an inner diameter of 6 mm to 12 mm and an outer diameter of 40 mm or more. If the inner diameter is 6 mm or more, the size of the clear area 11 can be ensured to be sufficient. Also, if the inner diameter is 12 mm or less and the outer diameter is 40 mm or more, the size of the defocus area 12 can be ensured to be sufficient, which is preferable for realizing the defocusing effect described below.
• the defocus area 12 is composed of a plurality of segment areas 12a.
• the segment areas 12a are provided to allow the light beam incident on the object side surface of the eyeglass lens 10 to exit from the eyeball side surface, and to focus the light beam at a position different from the retina of the eyeglass wearer's eyeball.
• the segment areas 12a are areas for achieving a power different from the prescribed power of the eyeglass wearer in order to focus the light beam at a position different from the retina, and are configured to be given a power different from the prescribed power.
• the defocus region 12 also functions as a region for achieving a power different from the prescription power of the eyeglass wearer in order to focus the light beam at a position different from that on the retina.
• the defocus region 12 may be a region formed by combining multiple segment regions 12a, or may be a region formed by combining multiple segment regions 12a with non-segment regions that are regions other than the segment regions 12a.
• the multiple segment regions 12a that make up the defocus region 12 each have a convex portion 12b formed on the object-side surface of the eyeglass lens 10, as shown in FIG. 2.
• the convex portion 12b has a curved surface that protrudes convexly toward the object side, and is configured to have a positive defocus power with respect to the prescription power of the clear region 11, so that the light beam passing through the eyeglass lens 10 is focused at a position closer to the object side than on the retina.
• the segment region 12a having the convex portion 12b focuses the light beam at a position closer to the object side than on the retina, thereby providing a myopia progression suppression effect that suppresses the progression of myopia in the case where the eyeglass wearer is myopic.
• each segment region 12a is not limited to having a convex portion 12b.
• Each segment region 12a may have, for example, a concave portion having a curved surface that curves in the opposite direction to the convex portion 12b (i.e., a concave portion that focuses the light beam at a position farther from the object side than the retina) so long as it focuses the light beam passing through the eyeglass lens 10 at a position different from the retina.
• each segment region 12a it may be decided for each segment region 12a whether to use convex shaped portions 12b or concave shaped portions, or whether to use a mixture, depending on the degree of refractive error of the wearer.
• convex shaped portions 12b may be used for myopic patients
• concave shaped portions may be used for hyperopic patients.
• focusing the light beam at a position other than on the retina in order to obtain the effect of inhibiting the progression of myopia or improving hyperopia may hereinafter be referred to as the "defocusing effect.”
• each segment region 12a is configured with a convex portion 12b, but even if it is configured with a concave portion, the optical effects, which will be described in detail later, are substantially the same in both cases, except for those due to the focusing position of the light beam.
• the convex portions 12b constituting each segment area 12a are arranged to line up along the curved surface constituting the clear area 11 (i.e., the curved surface for realizing the prescription power of the eyeglass wearer) as shown in FIG. 2.
• the curved surface constituting the clear area 11 is an optical surface that functions as a single focus lens according to the prescription power of the eyeglass wearer.
• the convex portions 12b of each segment area 12a are arranged along a curved surface that is composed of a curvature that is the same as, or that is so small that it can be considered to be the same as, the optical surface that is configured to focus light on the retina of the eyeball.
• the convex portions 12b are arranged along such a curved surface, differences in magnification, etc. between the clear area 11 and the defocus area 12 can be suppressed, and a situation in which the size of the eye, etc. appears different depending on the area when another person looks at the wearer's appearance will not occur.
• Each segment area 12a configured in this manner has a planar size d, arrangement interval p, and refractive power set as follows to focus the light beam at a position other than the retina.
• the planar size d of the segment area 12a is a representative value of the size (size) of the area surrounded by the boundary line of the intersection line between the curved surface (hereinafter referred to as the "segment curved surface") constituting the segment area 12a when the segment area 12a exists alone and the lens curved surface (hereinafter referred to as the "base lens curved surface”) that serves as the base when the segment area 12a is arranged, when viewed in plan.
• the boundary line is circular
• the planar size d corresponds to the maximum, average, or median value of the diameter of the circle.
• a segment region 12a is a region surrounded by the intersection lines between the segment curved surface of the segment region 12a and the segment curved surfaces of all adjacent segment regions 12a or the intersection lines with the base lens curved surface.
• the planar size d of the segment region 12a is set to be in the range of, for example, 0.25 mm to 2.0 mm, preferably 0.25 mm to 1.3 mm. If the planar size d is 0.25 mm or more, this is preferable in that it reduces the difficulty of forming fine irregularities compared to when the planar size d is smaller than 0.25 mm. Also, if the planar size d is 2.0 mm or less, preferably 1.3 mm or less, this is preferable in that irregularities of such size are difficult to perceive, and the aesthetic appearance of the eyeglass lens 10 is prevented from being impaired.
• the spacing p of the segment regions 12a is the distance between reference points (e.g., the center point of the planar shape or the apex of the convex shape when the segment region 12a exists alone) in adjacent segment regions 12a when each segment region 12a is viewed in a plane.
• the lower limit of the arrangement interval p of the segment regions 12a is set to, for example, 0.25 mm or more, preferably 1.0 mm or more. If the arrangement interval p is 0.25 mm or more, scattered reflection due to external lighting is suppressed, and the eyeglass lens 10 does not appear to others to flicker white. In addition, by making the arrangement interval p somewhat large, 1.0 mm or more, the risk of flickering (looking like a screen door) for the eyeglass wearer due to false resolution caused by the diffraction effect brought about by the periodicity of the arrangement is also reduced.
• the upper limit of the arrangement interval p of the segment regions 12a is set, for example, based on the pupil diameter of the human eye, and is set to 2.0 mm or less, which is about half the average pupil diameter. By making the arrangement interval p somewhat small, 2.0 mm or less, local prism is suppressed and eye convergence is not affected.
• the planar size d and arrangement interval p of the segment area 12a can be determined by the ratio between the area of the segment area 12a and the area of the non-segment area other than the segment area 12a, which will be described in detail later. If the aim is to suppress the progression of myopia or improve hyperopia, it is necessary to reduce the area of the non-segment area. As an example, if the center of the segment area 12a, which has a circular planar shape, is placed at the apex of a triangle that constitutes a triangular lattice, it is desirable to set the planar size d and arrangement interval p to satisfy the relationship 0.866 ⁇ p/d ⁇ 1.1.
• segment regions 12a may be arranged in other patterns instead of being arranged at the vertices of the triangles that make up the triangular lattice, and in that case, a different constraint condition can be set for p/d so as to maximize the desired defocusing effect.
• the refractive power of the segment area 12a is the defocus power due to the convex portion 12b of the segment area 12a.
• the defocus power is not simply a "power" but is the difference in power between when there is the segment area 12a and when there is not (i.e., when there is a curved surface equivalent to the clear area 11) expressed in units of D (diopters). In other words, the defocus power corresponds to the difference in power relative to the clear area 11.
• the refractive power (defocus power) of the segment region 12a is set appropriately to achieve the defocus effect. If the planar size d and arrangement interval p satisfy the above-mentioned constraints (conditions), it is possible to adjust the degree of the defocus effect by adjusting the defocus power without excessively increasing or decreasing the risk. Specifically, the defocus effect can be achieved by setting the defocus power to, for example, about 3.51D to 5.80D.
• the convex portion 12b of each segment region 12a having such refractive power is not particularly limited in its curved shape, but it may be formed, for example, from a spherical shape (spherical lens). In this case, it is preferable in that excessive scattering is less likely to occur when the light beam passes through the eyeglass lens 10. It may also be formed, for example, from an aspherical shape (aspherical lens) with a stronger degree of power on the peripheral side than near the apex (center) of the convex portion 12b. In this case, it is preferable in terms of maximizing the defocusing effect, since the peripheral portion contributes to reduced vision.
• aspherical shape spherical lens
• the area ratio of the segment region 12a is set as follows.
• the area ratio of the segment region 12a refers to the ratio of the area of the non-segment region to the area of the combined region of each segment region 12a and the non-segment region.
• the area ratio of the non-segment area is set to be 0% or more and 25% or less.
• the upper limit of the area ratio of the non-segment area can be preferably 18% or less, more preferably 12% or less, and even more preferably 10% or less. If it is 18%, the boundary length between the segment area 12a and the non-segment area per area of the segment area 12a can be made smaller than that in the case of 25%, and if it is 12%, it can be made even smaller. By limiting the boundary length in this way, it is preferable to suppress light scattering and the like caused by the boundary between the segment area 12a and the non-segment area.
• the lower limit of the area ratio of the non-segment area is preferably set to 2.4% or more. This is because, at 2.4%, the boundary length between the segment area 12a and the non-segment area per area of the segment area 12a becomes a minimum value.
• the boundary length per area of the segment region 12a will be larger than when the lower limit is 2.4% or higher, and the scattering per defocusing effect may become larger.
• the portion of the defocus region 12 here refers to a region that belongs to a range of a predetermined diameter D assumed at any position within the defocus region 12.
• the predetermined diameter D is, for example, ⁇ 2.5 mm or more and ⁇ 5.0 mm or less, and preferably about 4.0 mm, which is the average pupil diameter.
• each segment area 12a is arranged with periodicity.
• Periodicity means that each segment area 12a is arranged repeatedly according to a certain rule. Therefore, even if each segment area 12a is not spaced equally, as long as it is arranged with some regularity, it is considered to be arranged with periodicity. For example, even if there is some regularity in an arrangement of multiple segment areas 12a in which certain positions are thinned out, it is considered to have periodicity.
• each segment region 12a is arranged so that adjacent segment regions 12a are in contact with each other.
• the segment regions 12a are arranged so that their entire periphery is in contact with other segment regions 12a.
• each segment region 12a is arranged so that at least a portion of it is in contact with other segment regions 12a.
• FIG. 3 is an explanatory diagram showing an example of the arrangement of the segment regions 12a.
• the illustrated example shows a case where the entire periphery of each segment region 12a is in contact with other segment regions 12a, and the area ratio of non-segment regions is 0%.
• the segments 12a are arranged so that their centers are located at the vertices of the triangles that form the triangular lattice.
• the segments 12a are arranged in a honeycomb (staggered) pattern.
• the segments 12a are arranged in such a manner that the peripheries of the segments 12a overlap and overlap each other.
• each segment 12a is a polygon (specifically, a hexagon, for example) defined by the boundaries of the curved surfaces of the segments.
• each segment region 12a is circular, part of the periphery of the segment region 12a is in contact with other segment regions 12a, and the area ratio of the non-segment regions is greater than 0%.
• the centers of the segment regions 12a are also positioned at the vertices of the triangles that make up the triangular lattice, and the segment regions 12a are positioned in a honeycomb (staggered) pattern.
• the segment regions 12a do not overlap, and a portion of the periphery of each segment region 12a contacts other segment regions 12a, so that non-segment regions 12c exist between each segment region 12a.
• the area ratio of the non-segment regions 12c is 25% or less.
• FIG. 5 is an explanatory diagram showing an example of a cross-sectional configuration of the non-segment region 12c.
• the non-segment area 12c can be formed in a curved shape (i.e., a concave shape) that curves in the opposite direction to the convex portion 12b so as to connect adjacent convex portions 12b.
• the segment area 12a focuses the light beam at a position closer to the object side than the retina
• the non-segment area 12c focuses the light beam at a position farther from the object side than the retina.
• the non-segment area 12c can be formed in a curved shape having a defocus power of a different sign from that of the segment area 12a so as to focus the light beam at a position on the opposite side of the retina from that of the segment area 12a.
• the non-segment area 12c has a surface with a negative power compared to the power in the clear area 11 (i.e., the prescribed power).
• This configuration is suitable for obtaining the optical characteristics described below, and can efficiently reduce contrast, and is particularly robust against manufacturing errors in the planar size d of the segment area 12a. Furthermore, as in the optical characteristics described below, the high frequency part of the contrast curve falls off cleanly, while the extremely low frequency part that causes glare is maintained, resulting in a comfortable fit for the eyeglass wearer. Furthermore, because the segment area 12a and the non-segment area 12c are smoothly connected, scattering and other issues that previously occurred at the boundary are reduced.
• both segment regions 12a and non-segment regions 12c can be regions different from the prescribed power.
• each segment region 12a is configured as a region surrounded by a convex closed curve.
• a convex closed curve refers to a closed contour shape with no concaves, such as a circle or a regular hexagon.
• non-segment regions 12c which are regions other than segment regions 12a, are configured as regions surrounded by non-convex closed curves.
• a non-convex closed curve refers to a contour shape that has a concave shape portion, or a contour shape that has a missing shape portion such as a hole, unlike a convex closed curve.
• the boundary between the segment region 12a and the non-segment region 12c or the boundary between the segment regions 12a can be considered as a point where the direction of the curved surface shape (positive or negative sign when expressed in terms of defocus power) changes.
• the defocus power is "0" for the boundary portion, but since the area thereof is an extremely small linear band, there is no need to consider such a portion as a single region, and such a portion does not affect the optical characteristics of the eyeglass lens 10.
• the first derivative is continuous.
• the first derivative being continuous means that the slope of the surface is not discontinuous. Therefore, if the first derivative is continuous, the continuity of the surface can be guaranteed, and a lens shape that is preferable for the eyeglass lens 10 can be formed.
• the area ratio of the non-segment area 12c is set to be 0% or more and 25% or less, but the area ratio does not necessarily have to be uniform within the defocus area 12.
• the segment areas 12a may be arranged so that the area ratio of the non-segment area 12c varies depending on the position within the area.
• the area ratio of the non-segment area 12c may be higher in the part closer to the clear area 11 (i.e., the intermediate part between the clear area 11 and the defocus area 12) than in other parts.
• the segment areas 12a are arranged so that the area ratio of the non-segment area 12c varies within the defocus area 12, the discomfort in the field of vision of the eyeglass wearer can be reduced while providing a defocusing effect.
• the planar size d of the segment area 12a is reduced and the area ratio of the non-segment area 12c is increased, the defocusing effect may be reduced, so it is preferable to increase the arrangement interval p of the segment areas 12a.
• the non-segment area 12c curved in the opposite direction to the convex portion 12b (i.e., concave), as this makes the contrast curve smoother and makes it easier for the eyeglass wearer to see.
• segment regions 12a are included within a range of a predetermined diameter (e.g., 4 mm) corresponding to the pupil diameter at any position within the defocus region 12. This is because if there are fewer than five segment regions 12a, there is a risk that they will be perceived as shaking.
• a predetermined diameter e.g. 4 mm
• each segment region 12a has a convex portion 12b
• the convex portion 12b may be formed from the lens material that constitutes the eyeglass lens 10. The same applies to the shape of the non-segment region 12c.
• the lens substrate is molded from a thermosetting resin material such as thiourethane, allyl, acrylic, or epithio. Note that other resin materials that provide the desired refractive index may be selected as the resin material that constitutes the lens substrate. Also, instead of a resin material, the lens substrate may be made of inorganic glass. If such a lens substrate is used, the formation of the convex portion 12b and the like can be performed by molding using a mold.
• the surface of the lens substrate may be coated with an optical film.
• optical films include a hard coat film (HC film) and an anti-reflection film (AR film), but in addition to these, other films may also be formed. These optical films may be formed using known techniques, and detailed explanations will be omitted here.
• the optical film covers each segment region 12a.
• the optical film may be formed thin so that its surface follows the surface shape of the lens substrate, or may be formed thick so as to fill in and smooth out the irregularities in the surface shape of the lens substrate.
• the non-segment region 12c can be easily formed into a curved shape (e.g., a concave shape) that curves in the opposite direction to the segment region 12a.
• the shape of the non-segment region 12c may be given in the process of grinding and cutting the mold.
• a discontinuous shape may be given in the grinding and cutting process of the mold, and then the shape may be given by smoothing in a subsequent polishing process.
• the shape may be given to the desired shape by taking into account deformation of the lens substrate caused by molding.
• the spectacle lens 10 which is composed of the lens substrate and the optical film, has a refractive index of 1.55 or more for the light beam incident on the object side surface, and preferably about 1.59.
• FIG. 6 is an explanatory diagram (part 1) showing a specific example of the optical characteristics of the eyeglass lens 10.
• the diagram shows the relationship between the contrast and spatial frequency of light transmitted through the lens, with the horizontal axis representing the spatial frequency (CPD: cycles per degree) and the vertical axis representing the contrast transfer function (MTF: Modulation Transfer Function). Transfer Function).
• Symbols B to D are comparative examples for the specific example of symbol A.
• Symbol B indicates a specific example of the optical characteristics of a single-focus lens with the same prescription power as the clear area 11 of the eyeglass lens 10 with the above-mentioned configuration.
• Symbol C indicates a specific example of the optical characteristics of an eyeglass lens that has a segmented area with a convex portion but does not satisfy the above-mentioned constraint (condition) (for example, the planar size of the segmented area is less than 0.2 mm, here 0.15 mm).
• Symbol D indicates a specific example of the optical characteristics of an eyeglass lens that has a segmented area with a convex portion but does not satisfy the above-mentioned constraint (condition) (for example, the area ratio of the non-segmented area is about 30 to 70%, here 50%).
• the spectacle lens 10 with the above-mentioned configuration has the contrast sensitivity cut low in the range of CPD>8 (see symbol A).
• the spectacle lens 10 acts as a low-pass filter that cuts the high frequency part while leaving the low frequency part, and can efficiently reduce the contrast in the high frequency part of the contrast curve. Therefore, the high frequency part is neatly cut while the extremely low frequency part that causes glare is maintained, so that the spectacle wearer feels good when wearing the glasses.
• the high frequency part is cut, which reduces scattering, etc., and this also improves the wearing comfort for the spectacle wearer.
• the contrast sensitivity in the range of CPD>8 is not sufficiently cut.
• Figure 7 is an explanatory diagram (part 2) showing a specific example of the optical characteristics of the eyeglass lens 10.
• the diagram shows the relationship between the optical transfer function of light transmitted through the lens and the defocus degree, with the horizontal axis being the defocus degree (diopter: Dpt) and the vertical axis being the optical transfer function (VSOTF: visual Strehl of the optical transfer function).
• FIG. 7(a) shows a specific example corresponding to the symbol A in FIG. 6 as the optical characteristics of the eyeglass lens 10 configured as described above. Both FIGS. 7(b) and (c) are comparative examples for the specific example of FIG. 7(a).
• FIG. 7(b) shows a specific example corresponding to the symbol C in FIG. 6.
• FIG. 7(c) shows a specific example corresponding to the symbol D in FIG. 6.
• a VSOTF peak is formed at a position near -2.5.
• a defocus peak is also formed, and it can be seen that the defocus effect for obtaining the effect of inhibiting the progression of myopia or improving hyperopia is reliably realized.
• the eyeglass lenses shown in FIGS. 7(b) and (c) do not fully form a defocus peak, and it cannot necessarily be said that they provide a defocus effect.
• FIG. 8 is an explanatory diagram (part 3) showing a specific example of the optical characteristics of the eyeglass lens 10.
• the illustrated example shows the results of a simulation of how a wearer of the eyeglass lens appears when viewed from a position 1 m in front of the wearer in an indoor environment with fluorescent lights installed on the ceiling.
• (a) shows a case where the planar size d of the segment region 12a is ⁇ 1.3 mm
• (b) shows a case where the planar size d of the segment region 12a is ⁇ 1.0 mm
• (c) shows a case where the planar size d of the segment region 12a is ⁇ 0.63 mm
• (d) shows a case where the planar size d of the segment region 12a is ⁇ 0.32 mm
• (e) shows a case where the planar size d of the segment region 12a is ⁇ 0.25 mm
• (f) shows a case where the planar size d of the segment region 12a is ⁇ 0.15 mm.
• the protruding height of the convex portion 12b from the base lens curved surface is 1.2 ⁇ m.
• FIG. 10(f) when the planar size d of the segment region 12a is ⁇ 0.15 mm, the eyeglass lens 10 appears cloudy and the outline of the wearer's eye appears blurred.
• FIGS. 10(a) to (e) when the planar size d of the segment region 12a is ⁇ 0.25 mm or more, the eyeglass lens 10 does not appear cloudy and the outline of the wearer's eye becomes clearly visible.
• a planar size d of the segment region 12a of 0.25 mm or more is highly preferable in terms of preventing the aesthetic appearance of the eyeglass lens 10 from being impaired.
• planar size d of the segment region 12a when the planar size d of the segment region 12a is ⁇ 1.3 mm, some areas begin to look like a mosaic. For this reason, the planar size d of the segment region 12a may be in the range of 0.25 mm to 2.0 mm, but from the viewpoint of preventing the aesthetic appearance of the eyeglass lens 10 from being impaired, it is even more preferable to set it to 1.3 mm or less.
• the eyeglass lens 10 described in this embodiment not only provides a defocusing effect to obtain a vision progression inhibition effect or a hyperopia improvement effect, but also does not impair the aesthetic appearance when the eyeglass lens 10 is viewed from the outside while being worn. Therefore, the eyeglass lens 10 described in this embodiment can eliminate the risk that the eyeglass wearer will feel reluctant to wear the eyeglasses, even when a vision progression inhibition effect or a hyperopia improvement effect is obtained.
• the clear area 11 on one of the optical surfaces on the object side or the eyeball side is designed as the first step in designing that optical surface.
• the shape of the curved surface constituting the clear area 11 is determined so that the light beam incident on the object side surface in the clear area 11 is emitted from the eyeball side surface and focused on the retina of the eyeglass wearer's eye.
• the position and size of the clear area 11 are determined so that it includes the lens center and/or eye point of the eyeglass lens 10.
• the second clear area 13 is also designed in the first step together with the design of the clear area 11.
• the curved surface determined in the first step will be the base lens curved surface that will be the basis for the second step described below.
• the defocus area 12 on the optical surface is designed. Specifically, the position and size of the defocus area 12 are determined so that it is arranged around the clear area 11. Then, within the range of the determined defocus area 12, a plurality of segment areas 12a are arranged so as to be aligned along the base lens curved surface, thereby determining the surface shape constituting the defocus area 12.
• each segment area 12a is arranged in a honeycomb (staggered) pattern on the optical surface, a virtual triangular net consisting of a combination of equilateral triangles with the arrangement interval p of each segment area 12a as the length of one side is stretched on the surface of the base lens curved surface, and the convex shaped portion 12b constituting each segment area 12a is arranged so that the reference point of each segment area 12a (for example, the center point of the planar shape or the apex of the convex shape) is located at each apex of the equilateral triangle in the triangular net.
• the reference point of each segment area 12a for example, the center point of the planar shape or the apex of the convex shape
• each segment area 12a when the peripheral areas of each segment area 12a overlap each other, the position with the highest height from the base lens curved surface, including the surface of the base lens curved surface, is regarded as the outermost surface of the optical surface. In this way, the convex portions 12b that make up each segment area 12a are joined together to obtain the surface shape of the optical surface of the defocus area 12 in the eyeglass lens 10.
• each segment region 12a When arranging each segment region 12a, at least the planar size d and arrangement interval p are set in advance so that the planar size d is in the range of 0.25 mm to 2.0 mm, the arrangement interval p is in the range of 0.25 mm to 2.0 mm, and the planar size d and arrangement interval p satisfy the relationship 0.866 ⁇ p/d ⁇ 1.1.
• the area ratio of the non-segment region 12c to the combined area of each segment region 12a and non-segment region 12c is 0% to 25%.
• each segment region 12a is arranged so that the area ratio of the non-segment region is 0% to 25%.
• FIG. 9 is an explanatory diagram showing a specific example of a procedure for designing a segment area.
• segment spherical surfaces in the first step, segment spherical surfaces (obviously aspheric surfaces are also acceptable) are discretely arranged on a plane.
• the plane at this time corresponds to the base lens curved surface.
• the example shown in the figure shows curved surfaces with a diameter of 1.2 mm and a height of 0.18 mm arranged at intervals of 1.3 mm.
• the diagram on the left shows the arrangement in a 2 mm square range
• the diagram on the right is a cross-sectional view taken along the arrow, with the solid and dotted lines in the diagram on the right corresponding to the arrow in the diagram on the left.
• smoothing is performed by a smoothing filter in the second step.
• the diagram on the left shows the diameter of the smoothing filter
• the diagram on the right shows its cross section.
• a uniform filter is used. Note that if the filter diameter is not set to be larger than the maximum inscribed radius of the non-segment area, the surface of the base lens curved surface will remain and be exposed.
• the optical surface of the eyeglass lens 10 of this embodiment can be designed.
• the eyeglass lens 10 of this embodiment can be manufactured based on the design results. Specifically, for example, a mold that reflects the design results is created, a molding process is performed using the mold to create a lens substrate, and an optical film is further formed on the lens substrate as necessary, thereby obtaining the eyeglass lens 10 of this embodiment.
• Gaussian function surfaces may be arranged without going through the procedure of forming discontinuous surfaces and then smoothing them, as in the example described above. This is equivalent to the procedure of smoothing a spherical segment area 12a with a small diameter (planar size d) relative to the pitch (arrangement interval p) using a Gaussian filter with a large diameter.
• the eyeglass lens 10 is provided with a defocus region 12 having a plurality of segment regions 12a, which provides a defocusing effect that focuses the light beam at a position different from that on the retina, and as a result, it is possible to obtain an effect of inhibiting the progression of myopia or improving hyperopia. Furthermore, since the area ratio of the non-segment regions 12c in the defocus region 12 is between 0% and 25%, it provides a defocusing effect while also acting as a low-pass filter that cuts out the high-frequency portion of the contrast curve while leaving the low-frequency portion, resulting in a comfortable fit for the eyeglass wearer.
• the clear area 11 is located so as to include the lens center, and the defocus area 12 is located around the clear area 11. Therefore, even if the defocus area 12 produces a defocusing effect, an area for clear vision is provided near the lens center, so the eyeglass wearer will not feel uncomfortable in this respect either. Furthermore, by having the defocus area 12 located around the clear area 11, it is possible to provide a function for obtaining an effect of inhibiting the progression of myopia or an effect of improving hyperopia, taking into account the rotation of the eyeball.
• the eyeglass lens 10 by appropriately setting the planar size d and arrangement interval p of the segment area, it is possible to realize a sufficient defocusing effect while suppressing scattered reflection due to external light, etc. Therefore, the lens does not appear white and flickering when viewed by others, and the unnatural appearance is reduced, improving the aesthetic appearance when worn, so that the eyeglass wearer does not feel uncomfortable in that respect.
• the eyeglass lens 10 makes it possible to inhibit or reduce the progression of refractive errors, while allowing the eyeglass wearer to wear the eyeglasses without feeling any discomfort.
• the non-segmented area 12c is formed in a curved shape that focuses the light beam at a position on the opposite side of the retina from the segmented area 12a, and has a surface with a negative power compared to the prescription power of the clear area 11. Therefore, the contrast can be efficiently reduced in the high frequency part of the contrast curve, and is particularly robust against manufacturing errors in the size of the planar size d of the segmented area 12a. Furthermore, while the high frequency part is neatly reduced, the extremely low frequency part that causes glare is maintained, resulting in a comfortable fit for the eyeglass wearer. Furthermore, scattering and the like are reduced, which also results in a comfortable fit for the eyeglass wearer.
• a convex portion is arranged on the object side surface of the eyeglass lens 10, thereby forming a segment area, but the present invention is not limited to this.
• a concave portion may be arranged instead of a convex portion, thereby forming a segment area.
• the convex or concave portion may be arranged on the eyeball side surface of the eyeglass lens 10, rather than on the object side surface.
• the convex or concave portion may be formed inside the eyeglass lens 10 (i.e., other than the surface) by being covered by an optical surface with a certain film thickness or more, thereby forming a segment area.
• the convex or concave portion may be formed in a membrane or film and attached to the lens surface or sandwiched inside the lens.
• the eyeglass lens 10 is used to treat unilateral amblyopia, but the present invention is not limited to this and can be used for other purposes.

Landscapes

• Health & Medical Sciences (AREA)
• Ophthalmology & Optometry (AREA)
• Physics & Mathematics (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Eyeglasses (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=92906860

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (7)

• 2024
  • 2024-03-29 WO PCT/JP2024/013093 patent/WO2024204734A1/ja not_active Ceased
  • 2024-03-29 EP EP24780829.8A patent/EP4692910A1/en active Pending
  • 2024-03-29 CN CN202480005402.2A patent/CN120322723A/zh active Pending
  • 2024-03-29 KR KR1020257016826A patent/KR20250079051A/ko active Pending
  • 2024-03-29 AU AU2024248793A patent/AU2024248793A1/en active Pending
  • 2024-03-29 JP JP2025511281A patent/JPWO2024204734A1/ja active Pending

Patent Citations (7)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events