Eyewear lens, and, eyewear lens design method

Description

/ 37 Eyeglass Lens and Eyeglass Lens Design Method Technical Field

[001] The present description refers to spectacle lenses and a method of design for spectacle lenses. Description of the related technique

[002] In recent years, spectacle lenses that inhibit or reduce the progression of refractive errors, such as myopia and hyperopia, have attracted attention. For example, there are two types of lenses that suppress the progression of myopia: those that reduce contrast and those that provide a blurring effect. Patent Document 1 describes a method for reducing an arbitrary spatial frequency contrast by controlling Zernike aberration. Furthermore, Patent Document 2 describes a configuration in which light is scattered by bumps (point pattern) with a diameter of about 0.3 mm, thus reducing the arbitrary spatial frequency contrast. Prior art document Patent document

[003] [Patent document 1] JP 2021-073533 A

[004] [Patent document 2] JP 2022-068287 A Summary of the invention Problem to be solved by the invention

[005] It is preferable that a spectacle lens that suppresses or reduces the progression of refractive error not only has the effect of suppressing or reducing the progression of refractive error, but also does not cause discomfort to the user when wearing the glasses. However, the technique disclosed in Patent Document 1 is not intended to provide a function that takes into account the rotation of the eyeball, which is a specific problem with eyeglasses, and therefore there is a risk that the eyeglass wearer will experience discomfort. Petition 870250085549, dated 09 / 22 / 2025, page 58 / 100 / 37 respect. Furthermore, in the technique disclosed in Patent Document 2, the outer part of a lens appears to shimmer white due to light scattering, which is aesthetically unpleasant when the lens is worn, and may cause discomfort to the wearer of the glasses.

[006] One aspect of the present description provides a technique relating to a spectacle lens that allows the suppression or reduction of the progression of refractive error, enabling the user to wear the glasses without experiencing any discomfort. Ways to solve the problem

[007] A first aspect of the present description is a spectacle lens which includes: a transparent region positioned to include the center of the lens; and a defocusing region located around the transparent region, wherein the transparent region is configured as a single focal surface to which a prescription power is imparted, so that a beam of light incident from an object-side surface is emitted from an eyeball-side surface and converges onto the retina of the eyeball of a spectacle wearer; The defocusing region has a plurality of segmented regions to which a power different from the prescription power is transmitted, so that the incident light beam from the object-side surface is emitted from the eyeball-side surface and converges to a position different from that on the retina of the eyeball wearer; and the area ratio between the non-segmented regions and the combined area of ​​the plurality of segmented regions and the non-segmented regions, except for the segmented regions, in the defocusing region is 0% or more and 25% or less. Petition 870250085549, dated 09 / 22 / 2025, page 59 / 100 / 37

[008] A second aspect of the present description is the spectacle lens according to the first aspect, in which the plurality of segmented regions is arranged periodically.

[009] A third aspect of the present description is the spectacle lens according to the second aspect, in which the plurality of segmented regions is arranged so that a center of each segmented region is located at a vertex of each triangle that constitutes a triangular structure; A planar size d in a lens, when the segmented region exists in isolation, is in the range of 0.25 mm to 2.0 mm; and the planar size of an array spacing p satisfies a relationship of 0.866 < p / d < 1.1.

[0010] A fourth aspect of the present description is the spectacle lens according to the second or third aspect, in which the adjacent segmented regions are arranged so as to be in contact with each other.

[0011] A fifth aspect of the present description is the spectacle lens according to the first aspect, in which the segmental region has a convex portion with a positive defocusing power relative to the prescribing power, so that the light beam converges to a position closer to the side of the object than to the retina.

[0012] A sixth aspect of the present description is the spectacle lens according to the first aspect, in which the segmented region has a concave portion with a negative defocusing power relative to the prescription power, so that the light beam converges to a position further from the object side than on the retina.

[0013] A seventh aspect of the present description is the spectacle lens of Petition 870250085549, dated 09 / 22 / 2025, page 60 / 100 / 37 according to the fifth or sixth aspect, in which the unsegmented region is formed in a curved shape with a signal defocusing power different from that of the segmented region.

[0014] An eighth aspect of the present description is the spectacle lens according to the seventh aspect, in which a first derivative is continuous in the neighborhood of a boundary between the segmented region and the non-segmented region.

[0015] A ninth aspect of the present description is the spectacle lens according to the first aspect, wherein the segmented region is a region formed by a closed convex curve, and the non-segmented region is a region formed by a closed non-convex curve.

[0016] A tenth aspect of the present description is the spectacle lens according to the first aspect, including an optical film covering the plurality of segmented regions.

[0017] An eleventh aspect of the present description is the spectacle lens according to the first aspect, wherein the blurring region 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.

[0018] A twelfth aspect of the present description is the spectacle lens according to the eleventh aspect, in which the segmented regions are arranged in such a way that an area proportion of the non-segmented regions is different within the defocused region.

[0019] A thirteenth aspect of the present description is the spectacle lens according to the eleventh or twelfth aspect, in which five or more segmented regions are included. Petition 870250085549, dated 09 / 22 / 2025, p. 61 / 100 / 37 within a range of a predetermined diameter corresponding to a pupil diameter at an arbitrary position within the blur region.

[0020] A fourteenth aspect of the present description is a method of designing spectacle lenses for designing an optical surface on the object side or on the eyeball side, the method including: A first design step of an optical surface such that a transparent region configured as a single focal surface, endowed with a prescribing power, is located in a position that includes the center of the lens, to allow a beam of light incident on a surface on the object side to be emitted from a surface on the eyeball side and converge onto the retina of the eyeball of a spectacle wearer;and a second step of designing the optical surface so that a defocusing region with a plurality of segmented regions endowed with a power different from the prescription power is arranged around the transparent region, to allow the light beam incident on the object-side surface to be emitted from the eyeball-side surface and converge to a position different from that on the retina of the eyeball wearer, wherein the second step is the step of designing the optical surface so that an area ratio of the non-segmented regions relative to a combined region of the plurality of segmented regions and the non-segmented regions, except for the segmented regions in the defocusing region, is 0% or more and 25% or less. Advantage of the invention

[0021] According to one aspect of the present description, a spectacle lens is provided that enables the spectacle wearer to experience a comfortable fit when wearing the spectacles, while suppressing or reducing the progression of refractive error. Petition 870250085549, dated 09 / 22 / 2025, p. 62 / 100 / 37 Brief description of the drawings

[0022] FIG. 1 is an explanatory view showing an example of a flat configuration of a spectacle lens, according to an embodiment of the present description.

[0023] FIG. 2 is an explanatory view showing an example of a cross-sectional configuration of a spectacle lens, according to an embodiment of the present description.

[0024] FIG. 3 is an explanatory view showing an example of the arrangement of segmented regions in a spectacle lens, according to an embodiment of the present description.

[0025] FIG. 4 is an explanatory view showing another example of the arrangement of the segmented regions in the spectacle lens, according to an embodiment of the present description.

[0026] FIG. 5 is an explanatory view showing an example of a cross-sectional configuration of the unsegmented regions in the spectacle lens, according to an embodiment of the present description.

[0027] FIG. 6 is an explanatory view (part 1) showing a specific example of the optical properties of a spectacle lens, according to an embodiment of the present description.

[0028] FIG. 7A is an explanatory view (part 2) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a specific example corresponding to symbol A in FIG. 6.

[0029] FIG. 7B is an explanatory view (part 2) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a specific example corresponding to symbol C in FIG. 6.

[0030] FIG. 7C is an explanatory view (part 2) showing a specific example of the optical properties of spectacle lenses, according to Petition 870250085549, dated 09 / 22 / 2025, p. 63 / 100 / 37 with a version of the present description, which shows a specific example corresponding to symbol D in FIG. 6.

[0031] FIG. 8A is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ1.3 mm.

[0032] FIG. 8B is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ1.0 mm.

[0033] FIG. 8C is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ0.63 mm.

[0034] FIG. 8D is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ0.32 mm.

[0035] FIG. 8E is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ0.25 mm.

[0036] FIG. 8F is an explanatory view (part 3) showing a specific example of the optical properties of the spectacle lens, according to an embodiment of the present description, which shows a case where the planar size d of the segment region is φ0.15 mm.

[0037] FIG. 9A is an explanatory view showing a specific example of a procedure for projecting segmented regions onto a spectacle lens, according to an embodiment of the present description, which shows Petition 870250085549, dated 09 / 22 / 2025, p. 64 / 100 / 37, a first procedure.

[0038] FIG. 9B is an explanatory view showing a specific example of a procedure for projecting segment regions onto spectacle lenses according to an embodiment of the present description, which shows a second procedure.

[0039] FIG. 9C is an explanatory view showing a specific example of a procedure for projecting segment regions onto spectacle lenses according to an embodiment of the present description, which shows a third procedure. Detailed description of the invention

[0040] Next, an embodiment of the present description will be described with reference to the drawings. Note that the following description is merely an example, and the present invention is not limited to the embodiment illustrated. (1) Eyeglass lens configuration

[0041] First, a spectacle lens configuration will be described, according to an embodiment of the present description.

[0042] FIG. 1 is an explanatory view showing an example of a flat configuration of the spectacle lens, according to one embodiment, and FIG. 2 is an explanatory view showing an example of a cross-sectional configuration of the spectacle lens.

[0043] The spectacle lens presented as an example in this descriptive report has an object-side surface and an eyeball-side surface. The “object-side surface” is the surface located on the object side when eyeglasses fitted with the spectacle lens are worn by a user, and the “eyeball-side surface” is the opposite, i.e., the surface located on the eyeball side when eyeglasses fitted with the spectacle lens are worn by a user. This relationship also applies to the lens base material that forms the base of the spectacle lens. That is, the lens base material also has an object-side surface and an eyeball-side surface. Petition 870250085549, dated 09 / 22 / 2025, page 65 / 100 / 37 surface of the side of the eyeball.

[0044] In this descriptive report, the horizontal direction when the eyeglass lens is used is defined as the X direction, the up-down direction is defined as the Y direction, and the direction of the thickness of the eyeglass lens, which is perpendicular to the X and Y directions, is defined as the Z direction.

[0045] The Z direction is also a direction of the optical axis of the spectacle lens. An origin is the center of the lens. The “center of the lens” in this descriptive report refers to an optical or geometric center of the spectacle lens. This descriptive report shows, for example, a case where the optical center and the geometric center substantially coincide with each other. The “geometric center” refers to the center of a circle when the shape is circular in a plan view, such as an uncut lens before molding, and refers to the center of gravity in a plan view when the shape is other than circular.

[0046] Facing the user, the right side corresponds to the +X direction, the left side corresponds to the -X direction, the top side corresponds to the +Y direction, the bottom side corresponds to the -Y direction, the side of the object corresponds to the +Z direction, and the opposite direction (the back side direction) corresponds to the -Z direction. In this descriptive report, “plan view” refers to a state when viewed from the +Z direction to the -Z direction.

[0047] Each drawing in the present application illustrates a right eye lens in plano view, with the direction toward the nose corresponding to the +X direction and the direction toward the ear corresponding to the -X direction when the right eye lens is used.

[0048] Hereafter, when discussing a “position”, such as a viewpoint and the geometric center of a spectacle lens, this refers to a position in a planar view, unless otherwise specified.

[0049] As shown in FIG. 1, the spectacle lens 10 has, when viewed in plan view, at least one transparent region 11 Petition 870250085549, dated 09 / 22 / 2025, page 66 / 100 / 37 positioned so as to include a lens center and a defocus region 12 positioned around the transparent region 11. The spectacle lens 10 may include a second transparent region 13 around the defocus region 12.

[0050] The transparent region 11 is a portion with a smooth surface shape that can perform a refractive power prescribed for the user from the geometric optics point of view and is, for example, a portion that is transparent in a wavelength range of visible light. Thus, the transparent region 11 is configured to allow a beam of light incident from the surface on the side of the object to exit the surface on the side of the eyeball, enter the pupil of the user's eyeball, and converge onto the retina of the eyeball.

[0051] Furthermore, the transparent region 11 is configured as a region that includes the center of the lens and / or a point of view. The “point of view (PE)” is, for example, a position through which the line of sight passes when the lenses of eyeglasses are worn and the user looks straight ahead, and this example will be given below. The point of view can be a position through which the line of sight passes when the user visually recognizes an object close to him (in other words, when viewing up close), that is, a near point of view. One aspect of the present description shows, for example, a case where the geometric center of an eyeglass lens, before being fitted into a frame, coincides with the point of view, coincides with a prismatic reference point, and coincides with the center of the lens.The following is an example of a spectacle lens according to one aspect of the present description, before it is fitted into a frame, but the present description is not limited to this aspect. The position of the point of view can be specified by consulting a sighting chart or a centering chart issued by a lens manufacturer.

[0052] This transparent region 11 performs the prescriptive power (power Petition 870250085549, dated 09 / 22 / 2025, p. 67 / 100 / 37 spherical, cylindrical power, cylindrical axis, etc.) of the spectacle lens 10. Spherical power may be the power to be corrected when looking straight ahead (the object distance is from infinity to about 1 m) (e.g., 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).

[0053] In other words, transparent region 11 is the region to achieve a prescription power for the eyeglass wearer, so that the light beam is converged onto the retina and configured as a single focal surface to which the prescription power is transmitted.

[0054] The user's prescription information data is recorded on a lens pouch of the eyeglass lens. That is, when prepared as a set with the lens pouch, it can be identified as an eyeglass lens based on the user's prescription data. Generally, the eyeglass lens is supplied as a set with the lens pouch. Therefore, the technical idea of ​​the present description is reflected in the eyeglass lens that accompanies the lens pouch, and the same applies to the set of the lens pouch and the eyeglass lens.

[0055] The transparent region 11 is formed, for example, in a circular shape in a plan view. In this case, the size of the transparent region 11 is preferably defined so that, for example, an outer diameter is 6 mm or more and 12 mm or less. When the transparent region 11 is arranged in a position that includes the center of the lens and / or the user's point of view, taking into account the convergence of the eye of the spectacle wearer, the lens can be arranged so as to be displaced towards the side of the nose of the spectacle wearer relative to the center of the lens and / or the point of view.

[0056] When the spectacle lens 10 has a second transparent region 13, the second transparent region 13 is also configured from Petition 870250085549, dated 09 / 22 / 2025, page 68 / 100 / 37 in the same way as transparent region 11, except that it includes the center of the lens and / or the point of view.

[0057] The transparent region 11 and the second transparent region 13, as described above, function as a so-called single-focus lens.

[0058] The blurring region 12 is an annular region arranged to surround the transparent region 11. When the spectacle lens 10 includes the second transparent region 13, the blurring region 12 is positioned so as to be interspersed between the transparent region 11 and the second transparent region 13. In this case, it is preferable that the blurring region 12 be annular in shape, with an inner diameter of 6 mm or more and 12 mm or less and an outer diameter of 40 mm or more. When the inner diameter is 6 mm or more, the size of the transparent region 11 can be ensured as a necessary and sufficient size. Furthermore, when the inner diameter is 12 mm or less and the outer diameter is 40 mm or more, the size of the blurring region 12 can be ensured as a necessary and sufficient size, which is preferable for obtaining the blurring effect described later.

[0059] The defocusing region 12 is configured to have a plurality of segmented regions 12a. The segmented regions 12a are provided to allow a beam of light incident on the object-side surface to exit the eyeball-side surface of the spectacle lens 10, so that the beam of light is converged to a position different from that on the retina of the spectacle wearer's eyeball. In other words, the segmented regions 12a are the regions to receive a power different from the spectacle wearer's prescription power, so that the beam of light is converged to a position different from that on the retina, and are configured to receive a power different from the prescription power.

[0060] By providing a plurality of these segmented regions 12a, the blur region 12 also has the function of achieving a power Petition 870250085549, dated 09 / 22 / 2025, page 69 / 100 / 37 different from the prescription power of the glasses user, so that the light beam is converged to a position different from that on the retina. As will be described in detail later, the blurring region 12 can be a region formed by the combination of a plurality of segmented regions 12a, or a region formed by the combination of a plurality of segmented regions 12a with non-segmented regions that are different from the segmented regions 12a.

[0061] Each of the various segmented regions 12a that constitute the defocusing region 12 has a convex portion 12b formed on the object-side surface of the spectacle lens 10, as shown in FIG. 2. The convex portion 12b has a curved surface that projects convexly towards one side of the object and is configured to have a positive defocusing power relative to the prescription power of the transparent region 11, so that the light beam passing through the spectacle lens 10 is converged to a position closer to the object side than to the retina. Thus, it is known that by converging the light beam to a position closer to the object side than to the retina, the segment region 12a with the convex portion 12b can achieve a myopia progression suppression effect, which suppresses myopia progression in the case where the spectacle wearer is myopic.

[0062] However, each region of segment 12a is not limited to having the convex portion 12b. Each segmented region 12a may have, for example, a concave portion with a curved surface that curves in the opposite direction to the convex portion 12b (i.e., a concave portion that converges the light beam to a position further from the object side than from the retina), provided that it converges the light beam passing through the lens of the glasses 10 to a position different from that on the retina. Thus, it is known that, since the segmented region 12a has a concave shape and a negative defocusing power relative to the prescription power of the transparent region 11, the beam Petition 870250085549, dated 09 / 22 / 2025, page 70 / 100 / 37 of light converging to a position further from the object than from the retina, an improvement effect on hyperopia can be obtained, which improves the degree of hyperopia in the case where the glasses wearer is hyperopic.

[0063] With reference to these findings, it can be determined whether each segmented region 12a should have a convex portion 12b or a concave portion, or a mixture of both, depending on the degree of refractive error of the user. For example, the convex portion 12b can be used for myopic people, and the concave portion can be used for hyperopic people. In this way, converging a beam of light to a position other than that on the retina, in order to obtain the effect of suppressing the progression of myopia or improving hyperopia, can be referred to hereafter as the “defocusing effect”.

[0064] The following description shows a case where each segmented region 12a is configured to have a convex portion 12b, but even in the case where the concave portion is provided, an optical action, which will be described in detail later, is substantially the same in both cases, except that resulting from the convergent position of the light beam.

[0065] As shown in FIG. 2, the convex portions 12b that constitute each segmented region 12a are arranged so as to align along the curved surface that constitutes the transparent region 11 (i.e., the curved surface to achieve the prescription power of the eyeglass wearer). The curved surface that constitutes the transparent region 11 is an optical surface that functions as a single-focus lens according to the prescription power of the eyeglass wearer. That is, the convex portions 12b of each segmented region 12a are aligned along the curved surface, which has a curvature that is the same as, or differs very little from, the optical surface configured to converge the light beam onto the retina of the eyeball. When the convex portions 12b are aligned along this curved surface, the magnification difference or similar between the transparent region 11 and the defocusing region 12 can be suppressed, and when another person observes the appearance Petition 870250085549, dated 09 / 22 / 2025, page 71 / 100 / 37 of the user, the size of the eyes, etc., does not appear to differ depending on the region.

[0066] Each of the segmented regions 12a thus configured has a planar size d, array spacing pe, and refractive power defined as follows, so that the light beam is converged to a position different from that on the retina.

[0067] The planar size d of the segmented region 12a is a representative value of the size, when viewed in plan view, of an area enclosed by a contour line of the intersection between the curved surface that constitutes the segmented region 12a (hereinafter referred to as the “curved surface of the segment”) and a curved surface of the lens that serves as the basis for the arrangement of the segmented region 12a (hereinafter also referred to as the “curved surface of the base lens”) when the segmented region 12a exists in isolation. For example, when the contour line is a circle, the maximum value, the average value, the median value, or similar value of the circle's diameter corresponds to the planar size d.In reality, when the spacing between adjacent segmented regions 12a is sufficiently large, that is, when the segmented regions 12a are spaced from each other, the segmented regions 12a are the regions surrounded by the boundary line of intersection between the curved surface of the segment and the curved surface of the base lens. However, when the spacing between adjacent segmented regions 12a is small and the two segmented regions 12a partially overlap, the intersection line between both curved surfaces of the segment becomes the boundary line. In other words, the segment region 12a is a region surrounded by intersection lines between the curved surface of the segment of the segment region 12a and the curved surfaces of the segment of all adjacent segmented regions 12a, or intersection lines with the curved surface of the base lens.When two adjacent segmented regions 11 have at least one common boundary line, the two segmented regions 11 are said to... Petition 870250085549, dated 09 / 22 / 2025, p. 72 / 100 / 37 are “in contact” with each other.

[0068] In this embodiment, the planar size d of the segmented region 12a is adjusted to be in a range of, for example, 0.25 mm or more and 2.0 mm or less, and preferably in a range of 0.25 mm or more and 1.3 mm or less. When the planar size d is 0.25 mm or more, it is preferable that the difficulty in forming fine irregularities is reduced compared to when the planar size d is less than 0.25 mm. Furthermore, when the planar size d is 2.0 mm or less, and preferably 1.3 mm or less, irregularities of this size are difficult to perceive, which is preferable so that the aesthetic appearance of the spectacle lens 10 can be avoided.

[0069] The array spacing p between segmented regions 12a is a distance value between reference points in adjacent segmented regions 12a when each segment region 12a is viewed in plan view (e.g., the center point of a planar shape or the apex of a convex shape when the segment region 12a exists in isolation).

[0070] In this embodiment, a lower limit of the array spacing p between the segmented regions 12a is defined as, for example, 0.25 mm or more, and preferably 1.0 mm or more. When the array spacing p is 0.25 mm or more, scattered reflection due to external illumination is suppressed, and the lens of the spectacles 10 does not appear to other people as white flicker. Furthermore, by defining the array spacing p as relatively large, 1.0 mm or more, the risk of flicker (appearing like a screen door) for the spectacle wearer can be reduced, which is caused by false resolution due to diffraction effects caused by the periodicity of the array. An upper limit for the array spacing p between the segmented regions 12a is defined, for example, based on the diameter of the pupil of a human eye, and is defined as 2.0 mm or less, which is approximately half the average diameter. Petition 870250085549, dated 09 / 22 / 2025, p. 73 / 100 / 37 of the pupil. By setting the spacing of the p-array as slightly small, 2.0 mm or less, the local prism is suppressed and there is no effect on ocular convergence.

[0071] Furthermore, the planar spacing size p between the segmented regions 12a can be determined depending on the ratio to be used between the area of ​​the segmented regions 12a and the area of ​​the non-segmented regions, except for the segmented regions 12a, which will be described in detail later. When seeking the effect of suppressing myopia progression or improving hyperopia, it is better to reduce the area of ​​the non-segmented regions. For example, in the case where the center of the segmented region 12a, with a planar circular shape, is located at the vertex of a triangle that constitutes a triangular lattice, it is desirable to define the planar spacing size p so as to satisfy the relation 0.866 < p / d < 1.1. When satisfying p < 0.866d, the non-segmented regions existing between the segmented regions 12a disappear completely, therefore, there is no need to satisfy p / d < 0.866.On the other hand, when p / d > 1.1 is satisfied, the unsegmented regions become large, and there is a risk that the blurring effect, which is the objective of this technique, will not be achieved. Therefore, when the regions of segment 12a are arranged at the vertices of the triangles that constitute the triangular network, a maximum blurring effect can be obtained, satisfying the constraints (conditions) described above, defined for the planar size of the array spacing p. The regions of segment 12a can be arranged in other patterns instead of being arranged at the vertices of the triangles that constitute the triangular network. In this case, a different constraint can be defined for p / d, in order to maximize the desired blurring effect.

[0072] A refractive power of the 12a segment region is a defocusing power caused by the convex 12b portion of the 12a segment region. The defocusing power is not simply a “power,” but rather a deviation. Petition 870250085549, dated 09 / 22 / 2025, p. 74 / 100 / 37 expressed in D (diopter) units between a case where the region of segment 12a exists and a case where it does not exist (that is, in the case of a curved surface equivalent to that of transparent region 11). In other words, the blurring power corresponds to a power difference in relation to transparent region 11.

[0073] In this embodiment, the refractive power (blurring power) of the segmented region 12a is appropriately adjusted so that the spectacle lens 10 achieves the blurring effect. When the planar size of the array spacing p satisfies the above constraints (conditions), by adjusting the blurring power, the degree of blurring effect can be adjusted without excessively increasing or decreasing the risk. Specifically, by adjusting the blurring power to, for example, about 3.51 D to 5.80 D, the blurring effect can be achieved.

[0074] The convex portion 12b of each segmented region 12a with such refractive power is not particularly limited in its curved shape, but can be configured, for example, in a spherical shape (spherical lens). In this case, excessive scattering is less likely to occur when the light beam passes through the spectacle lens 10, which is preferable. Furthermore, for example, the convex portion 12b can be configured in an aspherical shape (aspherical lens), with greater refractive power at the periphery than near the apex (center) of the convex portion 12b. In this case, since the periphery contributes to the decrease in visual acuity, the maximum blurring effect is achieved, which is advantageous.

[0075] In addition, besides defining the planar size d, the spacing of the array and the refractive power of each segment region 12a, as described above, the area ratio of the segmented regions 12a is defined as follows. When the spectacle lens 10 is viewed in plan view, within the range of the defocus region 12, there may be a plurality of segmented regions 12a and non-segmented regions that are Petition 870250085549, dated 09 / 22 / 2025, page 75 / 100 / 37 regions different from the segmented regions 12a. The area ratio of the segmented regions 12a refers in this document to the ratio of the area of ​​the non-segmented regions in relation to the combined area of ​​the segmented regions 12a and the non-segmented regions.

[0076] In this embodiment, the area ratio of unsegmented regions is defined as 0% or more and 25% or less. An upper limit of the area ratio of unsegmented regions is preferably 18% or less, more preferably 12% or less, and even more preferably 10% or less. In the case of 18%, the limiting length between the segmented region 12a and the unsegmented region by area of ​​the segmented region 12a may be smaller than in the case of 25%, and when the area ratio is 12%, the limiting length may be even smaller. Limiting the edge length in this way is preferable in terms of suppressing light scattering and similar effects caused by the edge between the segmented region 12a and the unsegmented region. In the case of 10%, the planar size d of the segmented region 12a and the array spacing p can be approximately p / d = 1.0, further suppressing the edge length.A lower bound for the area ratio of unsegmented regions is preferably 2.4% or more. This is because, at 2.4%, the length of the boundary between the segmented region 12a and the unsegmented region becomes a minimum value. When the lower bound for the area ratio of unsegmented regions is below this limit, for example, 0%, i.e., when there are no unsegmented regions and the region is covered only by the segmented regions 12a, compared to the case where the lower bound is 2.4% or more, the length of the boundary of the segmented region 12a becomes larger, and the scattering due to blurring effect may become greater.

[0077] It is preferable that such an area ratio of the unsegmented regions be satisfied throughout the blur region 12. However, the Petition 870250085549, dated 09 / 22 / 2025, page 76 / 100 / 37 The area ratio of the non-segmented regions is not limited to it, it being sufficient that at least a partial region of the blur region 12, as shown in Figure 1, is satisfied. The partial region of the blur region 12 refers in this document to a region that belongs to a range of predetermined diameter D, assumed at an arbitrary position within the range of the blur region 12. The predetermined diameter D is, for example, φ 2.5 mm or more and φ 5.0 mm or less, and is preferably about 4.0 mm, which is an average pupillary diameter. In other words, the area ratio described above needs to be satisfied within a predetermined diameter D region, which is approximately the average diameter of the pupil assumed at an arbitrary position within the range of the blurring region 12.

[0078] By satisfying each restriction (condition) described above, the segmented regions 12a are respectively arranged with periodicity. The periodicity mentioned in this document means that the segmented regions 12a are repeatedly arranged according to a given rule. Therefore, the segmented regions 12a may not be arranged at equal intervals, but, as long as they are arranged with some regularity, they are considered to be arranged with periodicity. For example, in the arrangement of the plurality of segmented regions 12a, even in an arrangement where the segmented regions in specific positions are fine-tuned, there is periodicity when there is regularity.

[0079] Furthermore, the segmented regions 12a are respectively arranged so that adjacent segmented regions 12a are in contact with each other. For example, when the area ratio of the unsegmented regions is 0%, the segmented regions 12a are arranged so that their entire periphery is in contact with other segmented regions 12a. However, it is not necessary for the entire periphery to be in contact with other segmented regions 12a; it is sufficient that each region Petition 870250085549, dated 09 / 22 / 2025, page 77 / 100 / 37 segmented 12a be arranged so that at least part of segmented region 12a is in contact with another segmented region 12a.

[0080] Figure 3 is an explanatory view showing an example of the arrangement of segmented regions 12a. The figure shows a case where the entire periphery of each segmented region 12a is in contact with another segmented region 12a, and the area ratio of the non-segmented regions is 0%.

[0081] In the case of such an arrangement example, the segmented regions 12a are arranged so that the center of each segmented region 12a is positioned at the vertex of a triangle that constitutes a triangular network. In this way, the segmented regions 12a are positioned in a honeycomb (stepped) pattern. The segmented regions 12a are arranged in a positional relationship such that the neighborhood of their respective peripheries overlaps. Therefore, according to this arrangement example, each segmented region 12a can be arranged most efficiently within a limited range, and the planar shape of each segmented region 12a is a polygon (specifically, for example, a hexagon) defined by the boundaries of the curved surface of each segment.

[0082] FIG. 4 is an explanatory view showing another example of the arrangement of segmented regions 12a. In the illustrated example, the planar shape of each segmented region 12a is circular, part of the periphery is in contact with other segmented regions 12a, and the area proportion of the non-segmented regions is greater than 0%.

[0083] Also in this arrangement example, the center of each segmented region 12a is located at the vertex of a triangle that constitutes the triangular network, and the segmented regions 12a are positioned in a honeycomb (staggered) pattern. However, in the case of such an arrangement example, the segmented regions 12a do not overlap, and a part of the outer periphery of each segmented region 12a is in contact with other segmented regions 12a, and therefore, non-segmented regions 12c exist. Petition 870250085549, dated 09 / 22 / 2025, page 78 / 100 / 37 between the segmented regions 12a. However, the area ratio of the non-segmented regions 12c is 25% or less. Furthermore, in the case of this arrangement example, there is no discontinuous portion (step) at the boundary between the segmented region 12a and the non-segmented region 12c. Therefore, light scattering due to discontinuous portions does not occur, and the occurrence of a white appearance, particularly a mesh-like appearance, can be suppressed.

[0084] The arrangement examples shown in FIGS. 3 and 4 are merely illustrative, and the arrangement of segmented regions 12a is not limited to these examples.

[0085] When an unsegmented region 12c exists between the respective segmented regions 12a, the unsegmented region 12c can be configured as follows.

[0086] FIG. 5 is an explanatory view showing an example of a cross-sectional configuration of the unsegmented region 12c.

[0087] As shown in the figure, when each segmented region 12a has a convex portion 12b, the non-segmented regions 12c can be formed in a curved shape (i.e., a concave shape) that curves in the opposite direction to the convex portions 12b, so as to connect the adjacent convex portions 12b. In this case, in contrast to the situation where the segmented region 12a causes the light beam to converge to a position closer to the object side than to the retina, the non-segmented region 12c causes the light beam to converge to a position farther from the object side than to the retina. That is, the non-segmented region 12c can be shaped into a curved form with a defocusing power of opposite sign to that of the segmented region 12a, so as to cause the light beam to converge to a position on the opposite side of the segmented region 12a, with the retina interposed between them.

[0088] In other words, the unsegmented region 12c has a surface with a negative power compared to the power (i.e., a power of Petition 870250085549, dated 09 / 22 / 2025, page 79 / 100 / 37 prescription) in the transparent region 11. This configuration is suitable for obtaining the optical properties described below, can efficiently reduce contrast, and is particularly robust against manufacturing errors in the size of the d-plane of the segmented region 12a. Furthermore, as shown in the optical properties described below, a high-frequency portion of the contrast curve falls off smoothly, leaving an extremely low-frequency portion that causes glare, resulting in a comfortable fit for the eyeglass wearer. Additionally, because the segmented regions 12a and the non-segmented regions 12c are smoothly connected, scattering and similar issues that previously occurred at the edge are reduced.

[0089] As described above, in the configuration that includes segmented region 12a and non-segmented region 12c, both segmented region 12a and non-segmented region 12c can be regions with different prescriptive powers. In this case, each segmented region 12a is configured as a region enclosed by a convex closed curve. In this document, a convex closed curve is one that is enclosed by a contour shape without recesses, such as a circle or a regular hexagon. On the other hand, non-segmented regions 12c, which are regions different from segmented regions 12a, are each configured as a region enclosed by a non-convex closed curve. In this document, a non-convex closed curve is different from a convex closed curve and refers to a contour shape with a concave shape portion or a contour shape with an absent shape portion, such as a hole.

[0090] In the configuration above, the boundary between the segmented region 12a and the non-segmented region 12c or the boundary between the segmented regions 12a can be considered as a point of change of direction of the curved surface shape (positive or negative sign when expressed in terms of blurring power). Petition 870250085549, dated 09 / 22 / 2025, page 80 / 100 / 37

[0091] Furthermore, in the vicinity of the boundary between the segmented region 12a and the non-segmented region 12c, a first differential is continuous. In this document, the continuity of the first differential means that the slope of the surface is not discontinuous. Therefore, when the first differential is continuous, the continuity of the surface can be ensured and a preferred lens shape for the spectacle lens 10 can be configured.

[0092] As described above, the area ratio of the unsegmented regions 12c is defined as 0% or more and 25% or less, but the area ratio does not necessarily have to be uniform within the blur region 12. For example, in the blur region 12, the segmented regions 12a may be arranged, respectively, such that the area ratio of the unsegmented regions 12c varies depending on the position within the region. Specifically, in the portion closest to the transparent region 11 (i.e., an intermediate portion between the transparent region 11 and the blurred region 12), the area ratio of the unsegmented regions 12c may be higher compared to other portions. Thus, when the segmented regions 12a are arranged so that the area ratio of the non-segmented regions 12c varies within the blurred region 12, a blurring effect can be provided, reducing discomfort in the field of vision for the eyeglass wearer.In this case, when the flat size d of the segmented regions 12a is reduced and the area ratio of the non-segmented regions 12c is increased, the blurring effect can be reduced, and it is preferable to increase the spacing p between the segmented regions 12a. Furthermore, even in the intermediate portion with a high area ratio, it is preferable that the non-segmented region 12c have a curved shape (i.e., a concave shape) that curves in the opposite direction to the convex portion 12b, as this makes the contrast curve smoother and easier for the eyeglass wearer to see.

[0093] In any of the above cases (i.e., regardless Petition 870250085549, dated 09 / 22 / 2025, page 81 / 100 / 37 (regardless of whether the area ratio is uniform or not), it is preferable that five or more segmented regions 12a be included within a predetermined diameter range (e.g., 4 mm) corresponding to the pupil diameter at an arbitrary position within the blurring region 12. This is because, when there are fewer than five segmented regions 12a, there is a risk that this will be perceived as tremor.

[0094] When each segmented region 12a has a convex portion 12b, the convex portion 12b is considered to be formed from a lens base material that constitutes the spectacle lens 10. The same applies to the shape of the non-segmented region 12c.

[0095] The lens base material is composed of a thermosetting resin material, such as thiourethane, allyl, acrylic, or epithelium. As a resin material constituting the lens base material, other resin materials that can provide a desired refractive index may be selected. In addition, the lens base material may be composed of inorganic glass instead of resin material. When such a lens base material is used, the convex portion 12b or similar may be formed by a molding process using a mold.

[0096] The surface of the lens base material can be coated with an optical film. Examples of optical films include a hard coating film (HC film) and an anti-reflective film (AR film), and other films can also be formed. These optical films can be formed using a known technique, the detailed description of which will be omitted from this document.

[0097] When the optical film is coated, it covers each segmented region 12a. In this case, the optical film can be formed thin, so that its surface adapts to the shape of the surface of the lens base material, or it can be formed thick, so as to fill and smooth out irregularities in the shape of the surface of the lens base material. When the Petition 870250085549, dated 09 / 22 / 2025, page 82 / 100 / 37 optical film is formed thick, the non-segmented regions 12c can be easily formed into a curved shape (e.g., a concave shape) that is curved in the opposite direction to the segmented regions 12a.

[0098] The shape of the unsegmented 12c region can be obtained by a grinding and cutting process of the mold. Alternatively, a discontinuous shape can be obtained in the grinding and cutting process of the mold, which is then smoothed by a subsequent polishing process. In addition, the lens can be molded into the desired shape, considering the deformation of the lens base material caused by molding.

[0099] In both cases, it is preferable that the spectacle lens 10, composed of the lens base material and the optical film, has a refractive index of 1.55 or more, and more preferably about 1.59 for a light beam incident from the surface on the object side. (2) Optical properties of spectacle lenses

[00100] The optical properties of the spectacle lens 10 with the configuration described above will be described below.

[00101] FIG. 6 is a view (part 1) showing a specific example of the optical properties of spectacle lenses 10. The example shows a relationship between the contrast and the spatial frequency of light transmitted through a lens, with the horizontal axis indicating a spatial frequency (CPD: cycles per degree) and the vertical axis indicating the modulation transfer function (MTF).

[00102] In the figure, symbol A indicates a specific example of the optical properties of spectacle lens 10 with the configuration described above, in the case of p = 1.0 mm ep / d = 1.0. Symbols B to D are comparative examples in relation to the specific example of symbol A. Symbol B indicates a specific example of the optical properties of a single-focus lens with the same prescribing power as the transparent region 11 of spectacle lens 10 with the configuration described above. Symbol C indicates a Petition 870250085549, dated 09 / 22 / 2025, page 83 / 100 / 37 specific example of the optical properties of a spectacle lens that has a segmented region defined by a convex portion, but does not satisfy the restrictions (conditions) described above (for example, a planar size of the segmented region is less than 0.2 mm, in this case 0.15 mm). The symbol D indicates a specific example of the optical properties of a spectacle lens that has a segmented region defined by a convex portion, but does not satisfy the restrictions (conditions) described above (for example, an area ratio of the non-segmented region is approximately 30 to 70%, in this case defined as 50%).

[00103] As shown in FIG. 6, in the spectacle lens 10 with the configuration described above, contrast sensitivity is reduced to a low level in a CPD range > 8 (see symbol A). That is, such a spectacle lens 10 acts as a low-pass filter that cuts off high-frequency components, leaving the low-frequency components, and can efficiently reduce contrast in the high-frequency portion of the contrast curve. Consequently, the high-frequency components fall off smoothly, leaving the extremely low-frequency components that cause glare, resulting in a comfortable fit for the spectacle wearer. Furthermore, due to the falloff of the high-frequency portion, scattering and similar effects are reduced, which also improves the comfortable fit for the spectacle wearer.In contrast, in a spectacle lens that does not meet the restrictions (conditions) described above (see symbols C and D), the contrast sensitivity in the CPD > 8 range is not sufficiently clipped. For example, the spectacle lens indicated by symbol C exhibits peaks in contrast sensitivity at high spatial frequencies (e.g., CPD = 12, 18, 24) and is not preferred in terms of the risk of causing spurious resolution.

[00104] FIG. 7 is an explanatory view (part 2) showing a specific example of the optical properties of the spectacle lens 10. The illustrated example shows the relationship between the optical transfer function of Petition 870250085549, dated 09 / 22 / 2025, p. 84 / 100 / 37 light transmitted through the lens and the blurring power, with the horizontal axis indicating the blurring power (diopter: Dpt) and the vertical axis indicating the visual Strehl optical transfer function (VSOTF).

[00105] FIG. 7A shows a specific example of the optical properties of the spectacle lens 10 with the configuration described above, which corresponds to symbol A. FIG. 7B and FIG. 7C are comparative examples with the specific example in FIG. 7A. FIG. 7B shows a specific example corresponding to symbol C in FIG. 6. FIG. 7C shows a specific example corresponding to symbol D in FIG. 6.

[00106] As shown in FIG. 7A, for the spectacle lens 10 with the configuration described above, a VSOTF peak is formed not only at a position close to 0 Dpt, but also at a position close to -2.5. That is, a defocus peak is also formed, and it is verified that the defocus effect to obtain the effect of suppressing the progression of myopia or the effect of improving hyperopia is certainly achieved. In contrast, in the spectacle lenses shown in FIG. 7B and FIG. 7C, the defocus peak is not sufficiently formed, and it cannot be stated that the defocus effect is necessarily achieved.

[00107] FIG. 8 is a view (part 3) showing a specific example of the optical properties of spectacle lenses 10. The illustrated example shows the results of a simulation of the appearance of a person wearing spectacle lenses when viewed from a position 1 m away in an indoor environment with a fluorescent light installed on the ceiling.

[00108] FIG. 8A shows a case where the planar size d of the region of segment 12a is φ 1.3 mm, FIG. 8B shows a case where the planar size d of the region of segment 12a is φ = 1.0 mm. FIG 8C shows a case where the planar size d of the region of segment 12a is φ 0.63 mm, Petition 870250085549, dated 09 / 22 / 2025, page 85 / 100 / 37 FIG 8D shows a case where the planar size d of the region of segment 12a is φ 0.32 mm, FIG 8E shows a case where the planar size d of the region of segment 12a is φ = 0.25 mm, and FIG 8F shows a case where the planar size d of the region of segment 12a is φ 0.15 mm. In either of the above cases, the salient height of the convex portion 12b from the curved surface of the base lens is 1.2 pm.

[00109] When observing the appearance of a person wearing eyeglasses in an indoor environment exposed to fluorescent light, a composite image of the wearer's eyes, which is a transmitted image, and a reflected image of the fluorescent light are visually recognized on the surface of the eyeglass lens. In this case, when the segment size (segment diameter) on the eyeglass lens is large, the transmitted image will appear as a mosaic, but when the segment size is small, the mosaic effect will no longer be perceptible and the image will appear blurred overall. As the segment size decreases, the reflected image captures a wider range of illumination light, and the reflected light becomes visible across the entire lens. Due to the combined effects of these factors, the smaller the segment size, the more blurred the eyeglass lens appears.

[00110] As shown in FIG. 8F, when the plane size d of the segmented region 12a is φ 0.15 mm, the lens of the eyeglasses 10 appears whitish and cloudy, and the outline of the user's eye appears blurred. In contrast, as shown in FIG. 8A to FIG. 8E, when the plane size d of the segmented region 12a is φ 0.25 mm or more, the lens of the eyeglasses 10 does not become cloudy and the outline of the user's eye is clearly visible. For these reasons, it can be said that it is extremely preferable that the plane size d of the segmented region 12a be 0.25 mm or more, in order to avoid compromising the aesthetic appearance of the lens of the eyeglasses 10. Petition 870250085549, dated 09 / 22 / 2025, page 86 / 100 / 37

[00111] On the other hand, as shown in FIG. 8A, when the planar size d of the segmented region 12a is φ 1.3 mm, some parts of the region begin to look like mosaics. For this reason, the planar size d of the segmented region 12a can be in the range of 0.25 mm or more and 2.0 mm or less, but, from the point of view of avoiding compromising the aesthetic appearance of the spectacle lens 10, it is even more preferable to set the planar size d at 1.3 mm or less.

[00112] As described above, the spectacle lens 10 described in this embodiment not only has a blurring effect to suppress the progression of myopia or improve hyperopia, but also does not impair the aesthetic appearance of the spectacle lens 10 when viewed from the outside while being worn. Therefore, according to the spectacle lens 10 described in this embodiment, even when the effect of suppressing the progression of myopia or improving hyperopia is achieved, the risk of spectacle wearers feeling reluctant to wear them can be eliminated. (3) Design method and manufacturing method for spectacle lenses

[00113] Next, a design method and a manufacturing method for the spectacle lens 10 with the configuration described above will be described.

[00114] When designing eyeglass lenses 10, several data (prescription data), including the eyeglass wearer's prescription power, are specified beforehand.

[00115] Next, when designing the spectacle lens 10, first, the transparent region 11 on one of the optical surfaces on the object side and on the eyeball side is designed as a first step in the optical surface design. Specifically, based on pre-specified prescription data, the shape of the curved surface that constitutes the transparent region 11 is determined so that the incident light beam from the object side surface onto the transparent region 11 is emitted from the eyeball side surface and converges onto the retina of the eyeball. Petition 870250085549, dated 09 / 22 / 2025, page 87 / 100 / 37 eyeglass user. Furthermore, the position and size of the transparent region 11 are determined so as to include the center of the lens and / or the point of view of the eyeglass lens 10.

[00116] When the spectacle lens 10 has the second transparent region 13, the second transparent region 13 is also designed in the first step, along with the design of the transparent region 11.

[00117] The curved surface determined in the first step becomes a curved surface of the base lens, which will be the base in the second step described below.

[00118] Subsequently, in the second stage of the optical surface design, the defocus region 12 on the optical surface is designed. Specifically, the position and size of the defocus region 12 are determined so that they are arranged around the transparent region 11. Then, a plurality of segmented regions 12a are arranged in the range of the determined defocus region 12, so that they are aligned along the curved surface of the base lens, thus determining the shape of the surface that constitutes the defocus region 12.For example, in the case where the segmented regions 12a are arranged in a honeycomb (stepped) pattern on the optical surface, a virtual triangular lattice is stretched over the curved surface of the base lens, the lattice being constituted by a combination of equilateral triangles, each of which has a side length equal to the arrangement spacing p between each segment region 12a, and the convex portions 12b that constitute each segment region 12a are arranged so that the reference points of each segment region 12a (e.g., the midpoint of the planar shape or the vertex of the convex shape) are located at the vertices of the equilateral triangle in the triangular lattice. At this point, when the periphery of each segmented region 12a overlaps, the position with the greatest height from the curved surface of the base lens, including the surface of the curved surface of the... Petition 870250085549, dated 09 / 22 / 2025, page 88 / 100 / 37 base lens, is determined to be the outermost surface of the optical surface. In this way, the convex portions 12b that constitute each segmented region 12a are joined to obtain the shape of the optical surface of the defocusing region 12 in the spectacle lens 10.

[00119] When arranging each segmented region 12a, at least the planar size of the array spacing p is defined in advance so that the planar size d is in a range of 0.25 mm or more and 2.0 mm or less, the array spacing p is in a range of 0.25 mm or more and 2.0 mm or less, and the planar size of the array spacing p satisfies a ratio of 0.866 < p / d < 1.1. Thus, after each segmented region 12a is arranged, the area ratio of the unsegmented region 12c to the combined area of ​​each segmented region 12a and the unsegmented region 12c is 0% or more and 25% or less. That is, the segmented regions 12a are arranged, respectively, so that the area ratio of the unsegmented regions is 0% or more and 25% or less.

[00120] More specifically, when each segment region 12a is configured by the convex portion 12b, the segmented regions 12a can be arranged as follows.

[00121] FIG. 9 is an explanatory view that shows a specific example of a procedure for designing segmented regions.

[00122] As shown in FIG. 9A, as a first procedure, spherical segment surfaces (aspherical surfaces are also acceptable) are discretely arranged in a plane. The plane, at this point, corresponds to the curved surface of the base lens. The illustrated example shows a case where curved surfaces with a diameter of 1.2 mm and a height of 0.18 mm are arranged at 1.3 mm intervals. In FIG. 9A, the left side view shows the arrangement in a 2 mm square area, and the right side view shows a cross-sectional view taken along the arrows, with solid and dashed lines in the right side view corresponding Petition 870250085549, dated 09 / 22 / 2025, p. 89 / 100 / 37 to the arrows in the left side view.

[00123] Then, as shown in FIG. 9B, as a second procedure, smoothing is performed using a smoothing filter. In FIG. 9A, the left side view shows the diameter of the smoothing filter and the right side view shows its cross-section. In this example, a uniform filter is used. If the filter diameter is not set larger than a maximum radius inscribed in the unsegmented region, the curved surface of the base lens will remain exposed. When the filter is arranged in a honeycomb pattern, as described above, the relationship between filter diameter > arrangement spacing px \3 ^ 2 - planar size d is established. In this example, the diameter is 0.3 mm.

[00124] Subsequently, the segment height and the effective occlusion effect become large or small due to smoothing and, therefore, as shown in FIG. 9C, as a third procedure, the scale adjustment is performed in the height direction, while checking the shape and performance. Thus, the convex portions 12b in each segmented region 12a and the non-segmented region 12c between the segmented regions 11 are completed.

[00125] When machining such a surface shape, it is acceptable to convert it into spline data and add it to the base curve of the curved surface of the base lens.

[00126] Following the procedures described above, the optical surface of the spectacle lens 10 of this type can be designed.

[00127] After the optical surface design, the spectacle lens 10 of this embodiment can be manufactured based on the design result. Specifically, for example, a mold reflecting the design result is created, and a lens base material is created by performing the molding process using the mold and then, if necessary, an optical film is formed on the lens base material, in order to obtain the spectacle lens 10 of this embodiment. Petition 870250085549, dated 09 / 22 / 2025, page 90 / 100 / 37

[00128] Regarding the design method or manufacturing method of spectacle lenses 10, specific contents not described in this document may be performed using a publicly known technique.

[00129] When designing the spectacle lens 10, surfaces with Gaussian function can be arranged without going through the procedure of forming discontinuous surfaces and then smoothing, as in the example described above. This is equivalent to a procedure in which a spherical segment region 12a with a small diameter (planar size d) relative to the spacing (arrangement spacing p) is smoothed by a Gaussian filter with a large diameter.

[00130] Furthermore, if an optical film, such as an HC film, is applied in thickness during the manufacture of the spectacle lens 10, the periphery of the segment region 12a may drop, increasing the appearance of the planar size d. Therefore, taking this into consideration, a prospective adjustment can be made in the design phase of the spectacle lens 10 to subtract the amount of expansion from the diameter of the smoothing filter. For example, when the thickness of the HC film is 2 µm, the planar size d may increase by approximately 0.05 mm, and therefore, by adjusting the filter diameter to 0.30 - 0.05 = 0.25 mm, an appropriate planar size d can be obtained according to the degree of inclination of the HC film. (4) Effect of this modality

[00131] According to this modality, one or more of the following effects are achieved.

[00132] According to the spectacle lens 10 of this type, because it has a defocusing region 12 with a plurality of segmented regions 12a, it has a defocusing effect that causes a beam of light to converge to a position different from that on the retina, resulting in the effect of suppressing the progression of myopia or improving hyperopia. Furthermore, as the area ratio of the regions does not Petition 870250085549, dated 09 / 22 / 2025, p. 91 / 100 / 37 segmented 12c in the defocus region 12 is 0% or more and 25% or less, the spectacle lens 10 also acts as a low-pass filter that cuts the high-frequency portion of the contrast curve, leaving the low-frequency portion, resulting in the defocus effect and a comfortable fit for the spectacle wearer.

[00133] According to the spectacle lens 10 of this type, the transparent region 11 is positioned to include the center of the lens, and the defocusing region 12 is positioned around the transparent region 11. Therefore, even when the defocusing region 12 provides a blurring effect, an area for clear vision is provided near the center of the lens. In this respect as well, the spectacle wearer does not experience discomfort. Furthermore, by positioning the defocusing region 12 around the transparent region 11, it is possible to achieve the effect of suppressing the progression of myopia or improving hyperopia, considering the rotation of the eyeball.

[00134] According to the lens of this type of eyeglass, by properly adjusting the flat size of the spacing p of the segment region, a sufficient blurring effect is obtained, while suppressing scattered reflection due to external light and similar factors. Therefore, there is no white flicker that appears visible to other people, thus reducing an artificial appearance and improving aesthetics when wearing the eyeglasses. Also in this respect, the wearer of the eyeglasses does not feel discomfort.

[00135] As described above, the 10-lens eyeglass, according to this modality, allows suppressing or reducing the progression of refractive error, preventing the user from feeling discomfort when wearing eyeglasses.

[00136] Furthermore, according to the spectacle lens 10 of this modality, the unsegmented region 12c is formed in a curved shape, so that the light beam converges to a position on the opposite side of the segmented region 12a, with the retina interposed between them, and has a negative power compared to the prescription power of the region. Petition 870250085549, dated 09 / 22 / 2025, page 92 / 100 / 37 transparent 11. Therefore, the contrast can be effectively reduced in the high-frequency portion of the contrast curve, and the present invention is particularly robust against manufacturing errors in the size of the d-plane of the segmented region 12a. Furthermore, the high-frequency components fall off smoothly, leaving the extremely low-frequency components that cause glare, resulting in a comfortable fit for the wearer of the glasses. In addition, dispersion is reduced. This allows the wearer of the glasses to experience a comfortable fit when wearing them. (5) Modified example, etc.

[00137] The embodiments of the present description have been described above. However, the technical scope of the present invention is not limited to the content of the exemplary description above, and various modifications are possible without departing from the essence of the present description.

[00138] This embodiment shows a case where convex portions are arranged on the object-side surface of the spectacle lens 10, thus forming the segmented regions, but the present invention is not limited to this. For example, instead of convex portions, concave portions can be arranged to thus form the segmented regions. Furthermore, convex or concave portions can be arranged on the surface of the eyeball instead of the object surface of the lens 10. Additionally, for example, by being covered by an optical surface of a certain thickness or more, convex or concave portions can be formed within the lens 10 (i.e., elsewhere than the surface), thus forming the segmented regions. Furthermore, convex or concave portions can be formed on a membrane or film and can be fixed to the lens surface or intercalated within the lens.

[00139] This embodiment shows a case in which lens 10 is used to treat unilateral amblyopia, but the present invention is not limited to this and can be used for other purposes. Petition 870250085549, dated 09 / 22 / 2025, page 93 / 100 / 37 Description of signs and numerals

[00140] 10... eyeglass lens, 11... transparent region, 12... defocus region, 12a... segmented region, 12b... convex portion, 12c... non-convex region Petition 870250085549, dated 09 / 22 / 2025, page 94 / 100

Claims

1 / 4 CLAIMS 1. Eyeglass lens, characterized in that it comprises: a transparent region located so as to include the center of the lens; and a defocusing region located around the transparent region, wherein the transparent region is configured as a single focal surface to which a prescription power is transmitted, so that a beam of light incident from an object-side surface is emitted from an eyeball-side surface and converges onto the retina of the eyeball of an eyeglass wearer; the defocusing region has a plurality of segmented regions to which a power different from the prescription power is transmitted, so that the beam of light incident from the object-side surface is emitted from the eyeball-side surface and converges to a position different from that on the retina of the eyeball of the eyeglass wearer;and a ratio between the areas of the non-segmented regions and the combined area of ​​the plurality of segmented regions and non-segmented regions, excluding the segmented regions in the blur region, of either 0% or more and 25% or less.

2. Eyeglass lens according to claim 1, characterized in that the plurality of segmented regions is arranged periodically.

3. Eyeglass lens according to claim 2, characterized in that the plurality of segmented regions is arranged so that the center of each segmented region is located at a vertex of each triangle that constitutes a triangular structure; a planar size d in a lens, when the segmented region exists in isolation, is in the range of 0.25 mm to 2.0 mm; and Petition 870250085549, dated 09 / 22 / 2025, page 46 / 100 2 / 4 the planar size of an arrangement spacing p satisfies a relationship of 0.866 < p / d < 1.

1.

4. Eyeglass lens according to any one of claims 2 or 3, characterized in that the adjacent segmented regions are arranged so as to be in contact with each other.

5. Eyeglass lens according to claim 1, characterized in that the segmented region has a convex portion with positive defocusing power relative to the prescription power, such that the light beam converges to a position closer to the side of the object than to the retina.

6. Eyeglass lens according to claim 1, characterized in that the segmented region has a concave portion with negative defocusing power relative to the prescription power, such that the light beam converges to a position further from the object side than on the retina.

7. Eyeglass lens according to any one of claims 5 or 6, characterized in that the unsegmented region is formed in a curved shape with signal defocusing power different from that of the segmented region.

8. Eyeglass lens according to claim 7, characterized in that a first derivative is continuous in the neighborhood of a boundary between the segmented region and the non-segmented region.

9. Eyeglass lens according to claim 1, characterized in that the segmented region is a region formed by a closed convex curve, and the non-segmented region is a region formed by a closed non-convex curve.

10. Eyeglass lens according to claim 1, characterized by including an optical film covering the plurality of segmented regions.

11. Eyeglass lens according to claim 1, characterized in that the defocusing region 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.

12. Eyeglass lens according to claim 11, characterized in that the segmented regions are arranged in such a way that the area ratio of the non-segmented regions is different within the defocused region.

13. Eyeglass lens according to any one of claims 11 or 12, characterized in that five or more segmented regions are included within a predetermined diameter range corresponding to the diameter of the pupil at an arbitrary position within the defocusing region.

14. A method for designing eyeglass lenses for designing an optical surface on the object side or the eyeball side, characterized in that the method comprises: a first step of designing an optical surface so that a transparent region configured as a single focal surface, endowed with a prescription power, is located in a position that includes the center of the lens, to allow a beam of light incident on an object-side surface to be emitted from an eyeball-side surface and converge onto the retina of the eyeball of an eyeglass wearer;and a second step of designing the optical surface so that a defocusing region with a plurality of segmented regions endowed with a power different from the prescription power is arranged around the transparent region, to allow the light beam incident on the object-side surface to be emitted from the eyeball-side surface and converge to a position different from that on the retina of the eyeball of the spectacle wearer, wherein the second step is the step of designing the optical surface so that an area ratio of non-segmented regions relative to a combined region of the plurality of segmented regions and non-segmented regions different from the segmented regions in the defocusing region is 0% or more and 25% or less. 49 / 100;

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