Spectacle lens

Abstract

To provide a technique for fully utilizing defocus power that produces a myopia progression suppression effect or a hyperopia reduction effect while making it easier to focus, out of double images generated by an annular base region and an annular light flux non-convergence region, an image generated by the base region on a wearer's retina.SOLUTION: A spectacle lens and its related technique are provided. The spectacle lens exhibits a myopia progression suppression effect or a hyperopia reduction effect, comprises a center side clear region, a functional region, and an outer clear region, and satisfies conditions 1 to 3 in any circle that can be arranged when a base region and an on-retina non-convergence region are both annular bands, and each annular band, which is the on-retina non-convergence region, has a spherical shape in plan view, and a circle having a diameter of 4 mm is arranged in a functional region in plan view.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present invention relates to eyeglass lenses. [Background technology]

[0002] As a spectacle lens for suppressing the progression of refractive errors such as myopia, there is a lens having island-shaped regions formed thereon, each having a refractive power that is more positive than the prescribed refractive power (see, for example, Patent Document 1).

[0003] With a spectacle lens of this configuration, of the light beams that enter from the object-side surface and exit from the eyeball-side surface, the light beams that pass through areas other than the defocus area are focused on the wearer's retina, but the light beams that pass through the defocus area are focused at a position closer to the retina, thereby suppressing the progression of myopia.

[0004] Patent Document 2 discloses eyeglass lenses that are arranged to form a Fresnel lens-like pattern. In

[0036] of Patent Document 2, a "Fresnel lens pattern" is defined as a pattern in which one "spherical" shape is divided into a plurality of concentric rings and arranged in a stepped shape in cross section.

[0005]

[0008] of Patent Document 3 describes a spectacle lens in which a plurality of ring-shaped columnar microstructures of different radii outside the central optical region can all provide relatively stable refractive power and astigmatism. Providing the above-mentioned refractive power and astigmatism means that each ring is aspherical, as shown in Figures 2 and 4 of Patent Document 3. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 [Patent Document 2] WO2020 / 045567 Brochure [Patent Document 3] Chinese Patent No. 111103701 Summary of the Invention [Problem to be solved by the invention]

[0007] In the Fresnel lens pattern shown in Figure 7 of Patent Document 2, both the sawtooth portion that converges light rays at position A on the retina and the sawtooth portion that converges light rays at position B, which is closer to the object than position A, are spherical. This means that two images with different magnifications can be formed.

[0008] Consider a case in which a wearer views an object at a close distance through the eyeglass lens described in Patent Document 2. Because refractive power is the reciprocal of distance, viewing an object at a close distance requires a greater refractive power than viewing an object at a far distance. As a result, even though a sawtooth portion with greater power than a sawtooth portion that would converge a light beam at position A on the retina is provided to achieve a defocusing function, the sawtooth portion may result in a good image of the object at a close distance. In other words, the sawtooth portion may converge the light beam at position A on the retina. In this case, the sawtooth portion, which would normally converge the light beam at position A on the retina, may converge the light beam behind the retina (so-called underfocus). This may have the opposite effect of suppressing myopia progression, i.e., it may accelerate myopia progression.

[0009] As described in Patent Document 3, if the sawtooth portion is made aspherical, the light beam passing through the aspherical portion is less likely to converge than if it were spherical, making it less likely for the wearer to perceive double images. As a result, there is an advantage in that the image that should be obtained can be obtained in the portion without the aspherical surface (the so-called base region). On the other hand, because it is aspherical, it is difficult to converge light rays at position B, which is closer to the object side than position A. As a result, the defocusing power that should be obtained cannot be fully exerted.

[0010] One aspect of the present invention aims to provide a technology that makes it easier to focus the image generated by the base region, out of the double image generated by the annular base region and the annular light beam non-convergence region, on the wearer's retina, while fully utilizing defocus power that has the effect of inhibiting the progression of myopia or reducing hyperopia. [Means for solving the problem]

[0011] At least one annular zone, which is a retinal non-convergence region (described below) that brings about defocus power, is at least partially present within any circle of the pupil diameter (diameter 3 to 6 mm, for example, diameter 4 mm) in a planar view. Each annular zone, which is a retinal non-convergence region, is spherical. As an example, the surface shape of each annular zone, which is a retinal non-convergence region, is part of a sphere centered at a point on the optical axis. The present inventor has discovered a configuration in which spherical retinal non-convergence regions, to which different defocus powers are set, are present within each pupil diameter circle.

[0012] Suppose there is a lens with a base power zone and zones with defocus power 1 and defocus power 2. When a wearer is viewing near, they can use any of the three powers—base power, defocus power 1, and defocus power 2—to form an image on the retina. The other two powers produce a blurred image on the retina. The power ultimately used is thought to depend on the brightness of the image formed on the retina. If the area of ​​the base power zone is set larger than either defocus power 1 or defocus power 2 within any circle of the lens's pupil diameter (3–6 mm, e.g., 4 mm), the image formed by the base power will be the brightest, so the wearer will naturally see the image formed by the base power, while defocus power 1 and defocus power 2 will provide defocusing stimuli to the retina. This mechanism makes it easier for the image formed by the base power zone to be formed on the wearer's retina, out of the double image created by the annular base zone and the annular non-converging light beam zone. The definitions of "defocus power" and "base power" are discussed below.

[0013] Specific embodiments of the present invention based on the above findings are as follows. A first aspect of the present invention is A spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; a functional area having an annular shape surrounding the central clear area, the functional area including: a base area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; and a retinal non-convergence area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, while not causing a light beam incident into the wearer's pupil to converge on the retina; An outer clear area is an area around the functional area, and causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby achieving the wearer's prescribed refractive power; Equipped with In a planar view, the base region and the retinal non-convergence region are both annular zones, Each of the retinal non-convergence zones has a spherical shape, This is a spectacle lens that, when viewed in a plane, satisfies the following conditions for any circle that can be placed within the functional area, with the circle having a diameter of 4 mm. <Condition 1> Within the circle are the base region and the epiretinal non-convergence region. <Condition 2> The retinal non-convergence region existing within the circle has a plurality of locations with different curvatures. <Condition 3> When the inside of the circle is divided into regions each having a single power, the base region has the largest area.

[0014] A second aspect of the present invention is Meet any of the following i) to iii) and In the eyeglass lens according to the first aspect, the surface shape of each annular zone, which is the non-convergence area on the retina that satisfies i) or iii), is a shape formed by arranging spherical surfaces of different curvatures side by side in the radial direction. i) The surface shape of each annular zone, which is the non-convergence area on the retina, has multiple types of numerical curvatures, and the annular zones with different curvatures exist within the circle, thereby satisfying condition 2. ii) The surface shape of each annular zone that is the retinal non-convergence region has a single numerical value of curvature, and the condition 2 is satisfied by the existence of a plurality of annular zones with different curvatures within the circle. iii) The surface shape of each annular zone, which is the retinal non-convergence area, has multiple types of numerical curvature or a single numerical curvature, and satisfies condition 2 by having parts within the circle with different curvatures.

[0015] A third aspect of the present invention is Satisfies i) or iii), and The difference in curvature of the surface shape within each annular zone, which is the retinal non-convergence region, becomes equal or smaller in the radial direction away from the lens center, and The spectacle lens of the second aspect is characterized in that, among the zones that are the non-convergence areas on the retina, the difference in curvature of the surface shape within the zone farthest from the lens center is smaller than the difference in curvature of the surface shape within the zone closest to the lens center.

[0016] A fourth aspect of the present invention is Satisfies i) or iii), and This is a spectacle lens according to any one of the second to third aspects, wherein within each annular zone that is the retinal non-convergence region, the curvature of the surface shape on the side farthest from the lens center is greater than the curvature of the surface shape on the side closest to the lens center.

[0017] A fifth aspect of the present invention is The spectacle lens according to any one of the second to fourth aspects, wherein the number of types of the mutually different curvature values ​​is two to four.

[0018] A sixth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to any one of the second to fifth aspects, wherein within each annular zone that is the on-retinal non-convergence region, a spherical surface with a larger curvature, among the different curvatures, is arranged closer to the center.

[0019] A seventh aspect of the present invention is The spectacle lens according to any one of the first to sixth aspects, wherein the difference between the mutually different curvatures in Condition 2 is 0.25D or more.

[0020] An eighth aspect of the present invention is In the spectacle lens according to any one of the first to seventh aspects, in plan view, the functional area falls within a circle having the eye point as its center and having a diameter of any one value between 15.00 and 32.00 mm.

[0021] A ninth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to any one of the first to eighth aspects has an effect of inhibiting the progression of myopia.

[0022] Other aspects of the present invention that can be combined with the above aspects are as follows.

[0023] The central clear area (and the base area in the functional area, and further the outer clear area) of one aspect of the present invention functions as a so-called single-focus lens.

[0024] When a circle with a diameter of 4 mm is placed within the functional area in a planar view, the area of ​​the set of circles (excluding overlapping parts in the set) that satisfy conditions 1 to 3 when the placeable circles are grouped together (so-called planar area) may be 80% or more of the area of ​​the functional area, with 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, and 100% being preferred in that order.

[0025] In a planar view, the area (area ratio) of the retinal non-convergence area provided in the functional area relative to the area of ​​the retinal non-convergence area in the entire eyeglass lens is preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% or more, in that order.

[0026] There are no limitations on the size or shape of the central clear area 2. As for its shape, the contour line of the functional area closer to the lens center will be the shape of the central clear area. As a guideline for the lower limit of the size of the central clear area 2, it may be a size that can contain a circle with a diameter of 6.00 mm centered at the eyepoint. As a guideline for the upper limit of the size of the central clear area 2, it may be a size that can fit within a circle with a diameter of 13.00 mm centered at the eyepoint.

[0027] As a guideline, the functional region may be defined as a region in which 30% or more (or 40% or more, 50% or more, or 60% or more) of the light flux incident on the wearer's pupil does not converge onto the retina. The upper limit may be, for example, 70%. Furthermore, the base region may be set larger than any other non-convergence region within the functional region and / or the circle.

[0028] In the functional area, the area of ​​the retinal non-convergence area, which is configured to have the effect of inhibiting the progression of myopia or reducing hyperopia, in a planar view may be specified to be 20% or more and 80% or less of the entire functional area. The retinal non-convergence areas may be arranged so that they become sparser towards the outer edge of the functional area. Furthermore, the functional area may include multiple retinal non-convergence areas, and two or more types of defocus power may be set in the multiple retinal non-convergence areas, with the area of ​​each type of defocus power being approximately the same (for example, each area area may be within ±10% of the average area area per type).

[0029] However, in consideration of making it easier to obtain good visibility even in peripheral vision, it is preferable that no configuration intended to suppress the progression of refractive error (e.g., defocus area, convex area and / or concave area, embedded structure, etc.) is provided between the outer edge of the spectacle lens and the functional area. In other words, it is preferable that the entire area between the outer edge of the spectacle lens and the functional area is an outer clear area.

[0030] There are no limitations on the radial width of the retinal non-convergence region in the functional area and the radial width of the base region, as long as they satisfy the above conditions 1 to 3. For example, these values ​​may be within the range of 0.5 to 1.5 mm. These values ​​may be different from each other or may be the same value. For example, in the example described below, all of these values ​​(i.e., the radial width of the retinal non-convergence region in the functional area and the radial width of the base region) are set to 1.0 mm. Furthermore, there are no limitations on the number of each annular zone, as long as they satisfy the above conditions 1 to 3.

[0031] Regarding condition 3, if the base region has the largest area when the circle is divided into regions with a single power, the effects of the present invention will be achieved. On the other hand, even if only a small portion of the entire circle does not satisfy condition 3, the effects of the present invention may still be achieved.

[0032] The effects of the present invention are certainly achieved when all of the above conditions 1 to 3 are satisfied. On the other hand, the effects of the present invention may be achieved even if only a small portion of all the circles does not satisfy at least one of the above conditions 1 to 3.

[0033] For example, the "very small part" is as follows: When a circle with a diameter of 4 mm is placed within the functional area in a planar view, when the circles that can be placed are grouped together, the area (so-called planar area) of the group of circles (excluding overlapping parts in the group) that do not satisfy condition 3 above may be 20% or less of the area of ​​the functional area, with 15% or less, 10% or less, 5% or less, 1% or less, and 0% being preferred in that order.

[0034] In the spectacle lenses described above, by reversing the sign of the defocus power of the non-convergence area on the retina in the above content, the light beam will be focused on the opposite back side (-Z direction) rather than the front side (+Z direction), thereby achieving the effect of reducing hyperopia.

[0035] The matters described as an eyeglass lens, which is one aspect of the present invention, can also be applied to a design method or a manufacturing method of an eyeglass lens. An example is as follows. The following configuration may be combined with other contents described in this specification. "A method for designing or manufacturing a spectacle lens that has the effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; a functional area having an annular shape surrounding the central clear area, the functional area including: a base area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; and a retinal non-convergence area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, while not causing a light beam incident into the wearer's pupil to converge on the retina; an outer clear area that is located around the functional area and that causes a light beam that has entered through the object-side surface to exit through the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby achieving the wearer's prescribed refractive power; A method for designing or manufacturing a spectacle lens, comprising: In a planar view, the base region and the retinal non-convergence region are both annular zones, Each of the retinal non-convergence zones has a spherical shape, A method for designing or manufacturing a spectacle lens, in which, when a circle with a diameter of 4 mm is placed within the functional region in a plan view, any circle that can be placed satisfies the above conditions 1 to 3.

[0036] The technical concept of the present invention is also reflected in a pair of eyeglass lenses in which one aspect of the present invention is applied to each of a right-eye lens and a left-eye lens.

[0037] The technical concept of the present invention is also reflected in eyeglasses in which the vicinity of the periphery of the eyeglass lens is cut based on a predetermined frame shape and the eyeglasses are fitted into the frame. [Effects of the Invention]

[0038] According to one aspect of the present invention, it is possible to provide a technology that makes it easier to obtain good visibility even in peripheral vision when wearing a spectacle lens that has a clear area and a functional area. [Brief explanation of the drawings]

[0039] [Figure 1A] FIG. 1A is a schematic plan view of specific examples 1 and 2 of a spectacle lens according to one embodiment of the present invention. [Figure 1B] FIG. 1B is a graph showing the sag value of specific example 1 of a spectacle lens according to one embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 1C] FIG. 1C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 1 of a spectacle lens according to one embodiment of the present invention. [Figure 2A] FIG. 2A is a graph showing the sag value of specific example 2 of a spectacle lens according to one embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 2B] FIG. 2B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 2 of a spectacle lens according to an embodiment of the present invention. [Figure 3A] FIG. 3A is a schematic plan view of specific examples 3 and 4 of eyeglass lenses according to one embodiment of the present invention. [Figure 3B] FIG. 3B is a graph showing the sag value of specific example 3 of the eyeglass lens according to one embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 3C] FIG. 3C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 3 of a spectacle lens according to an embodiment of the present invention. [Figure 4A] FIG. 4A is a graph showing the sag value of specific example 4 of a spectacle lens according to one embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 4B] FIG. 4B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 4 of a spectacle lens according to an embodiment of the present invention. [Figure 5A] FIG. 5A is a schematic plan view of specific examples 5 and 6 of eyeglass lenses according to one embodiment of the present invention. [Figure 5B] FIG. 5B is a graph showing the sag value of specific example 5 of the eyeglass lens according to one embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 5C] FIG. 5C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 5 of a spectacle lens according to an embodiment of the present invention. [Figure 6A] FIG. 6A is a graph showing the sag value of a specific example 6 of a spectacle lens according to an embodiment of the present invention (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 6B] FIG. 6B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 6 of a spectacle lens according to an embodiment of the present invention. [Figure 7A] FIG. 7A is a schematic plan view of a spectacle lens according to Reference Example 1. FIG. [Figure 7B] FIG. 7B is a graph showing the sag value of the spectacle lens according to Reference Example 1 (vertical axis: sag value, horizontal axis: distance from the lens center). [Figure 7C]FIG. 7C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of the eyeglass lens according to Reference Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0040] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description of the preferred embodiments of the present invention is given by way of example only, and the present invention is not limited to the illustrated embodiments.

[0041] The spectacle lenses mentioned in this specification have an object-side surface and an eyeball-side surface. The "object-side surface" refers to the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens, and the "eyeball-side surface" refers to 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. In other words, the lens substrate also has an object-side surface and an eyeball-side surface. In one embodiment of the present invention, the object-side surface is a convex surface, and the eyeball-side surface is a concave surface. In other words, the spectacle lens in one embodiment of the present invention is a meniscus lens.

[0042] The spectacle lens according to one embodiment of the present invention is a myopia progression inhibiting lens, similar to the spectacle lens described in Patent Document 1. However, the spectacle lens according to one embodiment of the present invention is not limited to this. For example, the spectacle lens according to one embodiment of the present invention may be a hyperopia reducing lens. Note that myopia progression inhibition and hyperopia reduction inhibition are collectively referred to as refractive error progression inhibition.

[0043] In this specification, the horizontal direction when the eyeglass lens is worn is defined as the X direction, the vertical (up and down) direction as the Y direction, and the thickness direction of the eyeglass lens, which is perpendicular to the X and Y directions, 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, an example is given in which the optical center and the geometric center approximately coincide. As viewed from the wearer's perspective, the right is the +X direction, the left is the -X direction, the up is the +Y direction, the down is the -Y direction, the object side (nearby) is the +Z direction, and the opposite direction (backward) is the -Z direction. The near and far directions relate to the light beam passing through the center of the pupil, and although X and Y coordinates must also be taken into account in the strict sense when viewing peripheral vision, they are defined as above in this specification for the sake of convenience. In this specification, "planar view" refers to the state when viewed from the +Z direction to the -Z direction. The direction extending radially from the center of the lens is the +r direction, and the circumferential direction perpendicular to the r direction is the θ direction. In addition, if the functional area is provided only on the outermost surface on the eyeball side, the state when viewed from the -Z direction to the +Z direction may be considered as the planar view. Hereinafter, when discussing "positions" such as the eye point and geometric center of a spectacle lens, they refer to positions in a planar view unless otherwise specified.

[0044] In this specification, "to" indicates a value greater than or equal to a predetermined value and less than or equal to a predetermined value.

[0045] <Eyeglass lenses> A spectacle lens according to one aspect of the present invention comprises a central clear area, a functional area, and an outer clear area.

[0046] The central clear area has a smooth surface shape that can achieve the wearer's prescribed refractive power from a geometrical optics perspective, and is transparent in the visible light wavelength range, for example. The central clear area corresponds to the first refractive area in Patent Document 1.

[0047] The central clear area is an area that includes the center of the lens and / or the eye point, and is an area that causes the light beam that enters from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina.

[0048] The central clear region of one embodiment of the present invention can achieve prescribed power (spherical power, cylindrical power, cylindrical axis, etc.) This spherical power may be a power to be corrected when looking straight ahead (distance to an object is approximately from infinity to 1 m) (for example, distance power, hereinafter referred to as distance power) or a power to be corrected when looking at intermediate distances (1 m to 40 cm) or near distances (40 cm to 10 cm).

[0049] Furthermore, the central clear area does not include any configuration intended to have an effect of suppressing the progression of refractive error (for example, a defocus area, a convex area and / or a concave area, an embedded structure, etc.).

[0050] The central clear area (and the base area in the functional area, and further the outer clear area) of one aspect of the present invention functions as a so-called single-focus lens.

[0051] Incidentally, the prescription data of the wearer's information is written on the lens bag of the eyeglass lens. In other words, if there is a lens bag, it is possible to identify the eyeglass lens based on the prescription data of the wearer's information. Furthermore, eyeglass lenses are usually set with a lens bag. Therefore, the technical idea of ​​the present invention is also reflected in eyeglass lenses that come with a lens bag, and the same applies to sets of lens bags and eyeglass lenses.

[0052] The "eye point" is, for example, the position through which the line of sight passes when the wearer is wearing a spectacle lens and looking straight ahead, and this example will be given below. The eye point may also 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), i.e., the near eye point. In one aspect of the present invention, an example is given in which the geometric center of the spectacle lens before framing into the frame coincides with the eye point, coincides with the prism reference point, and coincides with the lens center. Hereinafter, a spectacle lens before framing into the frame will be given as an example of a spectacle lens of one aspect of the present invention, but the present invention is not limited to this aspect.

[0053] The position of the eye point can be specified by referring to a remark chart or a centration chart issued by the lens manufacturer.

[0054] The functional area is an area in which a light beam incident from the object-side surface is emitted from the eyeball-side surface, while at least a portion of a light beam incident into the pupil of the wearer is not converged onto the retina. The functional area is an annular area adjacent to and surrounding the central clear area in a planar view.

[0055] The annular outer clear area surrounding the functional area on the outer edge of the spectacle lens directs light beams incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina. In other words, the functional area is an annular area located between the outer clear area and the central clear area.

[0056] The functional area sandwiched between the outer clear area and the central clear area is composed of an epiretinal non-convergence area and a base area.

[0057] The base region has the same function as the central clear region (and the outer clear region described below). In one aspect of the present invention, the functional region other than the base region is a non-convergence region on the retina.

[0058] The non-convergence area on the retina is an area that does not converge the light beam incident on the pupil of the wearer onto the retina, and has a refractive power different from the prescribed refractive power exerted by the base area.

[0059] In one aspect of the present invention, the base region and the retinal non-convergence region within the functional region are both annular. There are no limitations on the shape of the annular region in a planar view, and the inner (outline closer to the lens center) and / or outer (outline farther from the lens center) of the annular region may be a perfect circle, ellipse, rectangle, or the like. In one aspect of the present invention, the base region and the retinal non-convergence region are concentric with the lens center, and the inner and outer contours are perfect circles. The dashed circles in Figures 1A, 3A, 5A, and 7A shown below correspond to these perfect circles.

[0060] In one aspect of the present invention, the annular zones that are retinal non-convergence regions and the annular zones that are base regions are arranged alternately in the radial direction.

[0061] The area between the annular zone of the retinal non-convergence area with the smallest diameter and the annular zone of the retinal non-convergence area with the largest diameter (including both annular zones) may be set as the functional area.

[0062] In one aspect of the present invention, the shape of each annular surface, which is a non-convergence area on the retina, is a part of a sphere centered on a point on the optical axis. In other words, each annular surface, which is a non-convergence area on the retina, is a spherical shape. This configuration, unlike the technology described in Patent Document 3, allows the defocusing power to be fully exerted.

[0063] In this specification, "defocus power" refers to the difference between the refractive power of each non-convergence area on the retina (in other words, the defocus area) and the refractive power of the area other than each defocus area (also called the base power). In other words, "defocus power" is the difference obtained by subtracting the refractive power of the base area (the base area, the central clear area, and the outer clear area) from the average value of the minimum and maximum refractive powers at a predetermined location of the non-convergence area on the retina.

[0064] In this specification, the term "refractive power" refers to the average refractive power, which is the average value between the refractive power in the direction in which the refractive power is minimum and the refractive power in the direction in which the refractive power is maximum (the direction perpendicular to that direction).

[0065] In a spectacle lens according to one aspect of the present invention, each annular zone, which is a non-convergence region on the retina, has a spherical shape. Therefore, the correspondence relationship between the defocusing power and the curvature of the spherical surface is clear. In this specification, the defocusing power is sometimes referred to as the curvature, and conversely, the curvature is sometimes referred to as the defocusing power.

[0066] In the spectacle lens according to one aspect of the present invention, when a circle with a diameter of 4 mm is placed within the functional region in plan view, any circle that can be placed satisfies the following condition. <Condition 1> Within the circle are the base region and the epiretinal non-convergence region. <Condition 2> The retinal non-convergence region within the circle has a plurality of locations with different curvatures. <Condition 3> When the inside of the circle is divided into regions each having a single power, the base region has the largest area. The 4 mm diameter circle is assumed to be the pupil diameter. The dashed circles in Figures 1A, 3A, 5A, and 7A shown below correspond to this circle. Instead of the 4 mm diameter circle, a circle with a single value in the range of 3 to 6 mm may be used, taking into account the expansion and contraction of the pupil diameter and individual differences.

[0067] By satisfying the condition 1, the retinal non-convergence area can suppress the progression of myopia, while the base area can realize the prescribed refractive power for the wearer from the viewpoint of geometrical optics. Note that it is sufficient that the annular zone, which is the retinal non-convergence area, exists partially within the circle.

[0068] By satisfying the condition 2, it is possible to have non-convergence areas on the retina that are set to have different curvatures (i.e., defocus powers) within the pupil diameter. With this configuration, even if an image is about to be formed on the retina due to defocus power 1 when the wearer is viewing near objects, the amount of light of the blurred image caused by defocus power 2 and the base power is large, and as a result, the wearer will not be able to see the image formed by the non-convergence areas on the retina. Therefore, the effect of suppressing the progression of myopia is maintained.

[0069] By satisfying the above condition 3, the wearer will naturally see the brightest image formed by the base power region with the largest area, and the non-convergence region on the retina will have the effect of suppressing the progression of refractive error.

[0070] Due to the above mechanism, of the double image produced by the annular base region and the annular light beam non-convergence region, the image produced by the base region can be more easily focused on the wearer's retina.

[0071] As a result, one aspect of the present invention can provide a technology that makes it easier to obtain good visibility even in peripheral vision when wearing a spectacle lens that has a clear area and a functional area.

[0072] <Preferred Examples and Modifications of the Spectacle Lens 1> Preferred examples and modified examples of the spectacle lens 1 according to one aspect of the present invention will be described below.

[0073] Condition 2, "there are a plurality of locations in the retinal non-convergence region existing within the circle that have different curvatures from one another," can be broadly divided into three modes. The three modes i) to iii) are as follows:

[0074] i) The surface shape of each annular zone, which is the on-retinal non-convergence region, has a plurality of types of curvature values, and the annular zones each have surface shapes with different curvature values, thereby satisfying the condition 2. This item corresponds to Examples 3 to 6 described below. Unless otherwise specified, hereinafter, this item will be exemplified.

[0075] "The surface shape of each annular zone has multiple types of numerical curvature" refers to the following aspect. That is, each annular zone, which is a non-convergence area on the retina, is composed of multiple sub-annular zones (for example, the non-convergence areas on the retina (No. 1), (No. 2), and (No. 3) described below) that are aligned and connected in the radial direction. These multiple sub-annular zones have different defocusing powers. The surface shape of each sub-annular zone is part of a sphere centered at a point on the optical axis.

[0076] The manner of this connection may be as follows: That is, the surface shape of each annular zone, which is the retinal non-convergence region that satisfies i) above or iii) below, may be a shape formed by connecting and arranging spherical surfaces with different curvatures. This case will be exemplified below.

[0077] In this item, the curvatures of the surface shapes are different from each other within one annular zone, which is a retinal non-convergence area. Therefore, in this item, if there is at least one retinal non-convergence area within the circle, condition 2, "there are multiple locations in the retinal non-convergence area that have different curvatures from each other," can be satisfied.

[0078] In the configuration of this item, the non-convergence area on the retina is still spherical. Therefore, unlike the aspherical shape described in Patent Document 3, the defocusing power that brings about the effect of suppressing the progression of myopia can be fully exerted.

[0079] Here we explain what is meant by the term "multiple locations." In the case of this item and in Examples 3 to 6 described below, even if there is one retinal non-convergence area within the circle, there are parts with different curvatures in the radial direction within that one area. Therefore, "multiple locations" refers to different parts within at least one retinal non-convergence area. In the case of ii) below, which is the case in Examples 1 and 2 below, two retinal non-convergence areas must exist within the circle. Therefore, "multiple locations" refers to separate retinal non-convergence areas.

[0080] ii) The surface shape of each annular zone, which is the non-convergence area on the retina, has a single numerical value of curvature, and the surface shape of a plurality of annular zones having different curvatures exists within the circle, thereby satisfying the condition 2. This item corresponds to Examples 1 and 2 described later.

[0081] This item differs from i) in that the surface shape of each annular zone, which is the retinal non-convergence zone, is a single spherical surface. Therefore, in this item, at least two retinal non-convergence zones are present within the circle to satisfy condition 2. The assumptions mentioned above are also applicable to this aspect. That is, even if an image is about to be formed on the retina due to defocus power 1 when the wearer views near, the amount of light of the blurred image caused by defocus power 2 and base power is large, and as a result, the wearer does not see the image formed by the retinal non-convergence zone. Therefore, the myopia progression suppression effect is maintained.

[0082] iii) The surface shape of each annular zone, which is the retinal non-convergence area, has multiple types of numerical curvatures or a single numerical curvature, and the surface shapes have portions with different curvatures within the circle, thereby satisfying the condition 2. This item is a combination of the above i) and ii). There are no limitations on the specific form of this mixture. For example, the above i) and ii) may be arranged alternately. Specifically, the following arrangement may be adopted, in order from the side closest to the center of the lens: ii) annular zone which is an on-retinal non-convergence region (annular zone consisting of symbol 3aα in specific examples 1 and 2 described below → annular zone which is a base region → i) annular zone which is an on-retinal non-convergence region (annular zone consisting of symbols 3a1 and 3a2 in specific examples 3 and 4 described below) → annular zone which is a base region → ii) annular zone which is an on-retinal non-convergence region (annular zone consisting of symbol 3aα or annular zone consisting of symbol 3aβ in specific examples 1 and 2 described below) → ... Otherwise, the explanations in i) and ii) above are applicable.

[0083] Hereinafter, preferred examples and modifications of the surface shape of each annular zone, which is the non-convergence area on the retina, that satisfies i) or iii) will be described.

[0084] It is preferable that the difference in curvature of the surface shape within each annular zone that is the retinal non-convergence region (i.e., the difference between the curvature of the child annular zone with the maximum curvature and the curvature of the child annular zone with the minimum curvature; the same applies hereinafter) becomes equal or smaller in the radial direction away from the lens center (also referred to as the former provision of Preferred Example 1), and that the difference in curvature of the surface shape within the annular zone that is the retinal non-convergence region and that is farthest from the lens center is smaller than the difference in curvature of the surface shape within the annular zone that is closest to the lens center (also referred to as the latter provision of Preferred Example 1). The latter provision is intended to exclude cases where the difference in curvature of the surface shape within each annular zone that is the retinal non-convergence region is always equal when viewed in the radial direction.

[0085] Within each annular zone, which is the retinal non-convergence region, it is preferable that the curvature of the surface shape on the side closest to the lens center is larger than the curvature of the surface shape on the side farthest from the lens center. This specific example is related to the retinal non-convergence region (part 1) and retinal non-convergence region (part 2) of specific examples 3 and 4, and to the retinal non-convergence region (part 1) and retinal non-convergence region (part 3) of specific examples 5 and 6. This is to ensure that when viewed through the annular zone, the image is in the opposite position to the object, thereby reliably preventing convergence on the retina. The details of this are as follows.

[0086] According to Prentiss's law, the prism of a lens is proportional to the product of the distance from the lens center and the power. Therefore, the farther the line of sight passing through the spectacle lens is from the eyepoint, the greater the dispersion of the image due to the different powers. Therefore, by adopting the configuration in the above paragraph, the expansion of the dispersion of the image in the non-convergence area on the retina with the different curvatures can be suppressed. It is said that applying a defocusing stimulus to the retina (especially the peripheral retina) is effective in suppressing the progression of refractive error. However, if an image is formed on the retina using this defocusing power, the defocusing stimulus may disappear, or the power of the prescription power that is present at the same time may apply a stimulus of the opposite defocusing power, which may have the opposite effect. The reason for simultaneously arranging non-convergence areas on the retina with multiple different defocusing powers within the pupil circle is to prevent an image from being formed on the retina using the defocusing power. Assuming that the total area of ​​the retinal non-convergence area is the same in both cases, providing retinal non-convergence areas with two types of defocus power can reduce the area of ​​the retinal non-convergence area for each type of defocus power compared to providing only a retinal non-convergence area with one type of defocus power. By reducing the area of ​​the non-convergence region on the retina of one defocus power, the amount of light decreases, reducing the advantage of forming an image on the retina. Since the amount of prism in the non-converging area on the retina differs for different defocusing powers, the two images are slightly misaligned, increasing the blurring and further reducing the possibility of imaging. However, if the image shift due to the prism difference is too large, the two images may not be confused and may appear independent. To prevent this, it is necessary to reduce the power difference (curvature difference) within the non-convergence area on the retina in the peripheral part of the lens, away from the center of the lens. The configuration that reflects the above findings is the preferred example 1. Note that the "spherical shape" in this specification also includes a spherical surface that provides a single power even if the amount of prism is changed in this way.

[0087] The number of different types of curvature values ​​may be 2 to 4. This configuration reduces the difficulty of manufacturing.

[0088] The arrangement of the sub-zones within each zone, which is the non-convergence area on the retina, is preferably such that the larger the diameter, the smaller the power, in order to maximize the function of suppressing the progression of refractive error by reducing the prism difference due to sub-zones with different powers and making the image unclear due to defocus power.

[0089] In condition 2, the difference in curvature between the two rings may be 0.25D or more. In the cases of i) and iii), the difference in curvature "within" each ring may be 1.00D or more. In the cases of ii) and iii), the difference in curvature "between" each ring may be 0.25D or more.

[0090] In addition, in consideration of Preferred Example 1, the provision in the preceding paragraph can also be said to mean that, among the zones that are the retinal non-convergence regions, the difference in curvature between adjacent sub-zones within a zone is at least 0.25 D. The difference in curvature within one zone (the difference between the curvature of the sub-zone with the maximum curvature and the curvature of the sub-zone with the minimum curvature) may be 0.50 D or more.

[0091] With this configuration, even if an image is about to be formed on the retina due to defocus power 1 when the wearer is viewing near objects, the formed image will appear even more blurred to the wearer due to the image created by the spherical surface of defocus power 2 that is close to the spherical surface of defocus power 1. As a result, of the double image created by the annular base region and the annular light beam non-convergence region, the image created by the base region will be more likely to be formed on the wearer's retina.

[0092] When a circle with a diameter of 4 mm is placed within the functional area in a planar view, the area of ​​the set of circles (excluding overlapping parts in the set) that satisfy conditions 1 to 3 when the placeable circles are grouped together (so-called planar area) may be 80% or more of the area of ​​the functional area, with 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, and 100% being preferred in that order.

[0093] In a plan view, the area (area ratio) of the retinal non-convergence areas 3a provided in the functional area 3 to the area of ​​the retinal non-convergence areas 3a in the entire spectacle lens 1 is preferably 80% or more, with the area ratio being preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% or more, in that order.

[0094] The shape of the outer edge side of the functional area 3 (that is, the shape of the outer clear area 4 on the functional area 3 side and the boundary between them) is preferably defined as follows.

[0095] The functional area 3 preferably falls within a circle whose center is the eyepoint and whose diameter is any one value between 15.00 and 32.00 mm. If the lower limit of this configuration is reached or exceeded, it is possible to ensure a sufficient area for the non-convergence region on the retina. If the upper limit of this configuration is set to or below the upper limit, the following effect can be obtained. That is, the farther the point through which the line of sight passes is from the lens center, the greater the difference in prism power between the base region and the retinal non-convergence region, and the greater the effect of double images on the wearer. Therefore, if the upper limit is set to or below the upper limit, the retinal non-convergence region is positioned not too far from the lens center, so the difference in prism power does not become excessive.

[0096] There are no limitations on the size or shape of the central clear area 2. As for its shape, the contour line of the functional area closer to the lens center will be the shape of the central clear area. As a guideline for the lower limit of the size of the central clear area 2, it may be a size that can contain a circle with a diameter of 6.00 mm centered at the eyepoint. As a guideline for the upper limit of the size of the central clear area 2, it may be a size that can fit within a circle with a diameter of 13.00 mm centered at the eyepoint.

[0097] By adopting the configuration described in the above paragraph, sufficiently good visibility can be obtained when viewed from the front.

[0098] In this example, the annular functional region 3 is composed of multiple annular zones (i.e., retinal non-convergence regions 3a) on a base region 3b that has the same shape as the central clear region 2 or outer clear region 4 as shown in Patent Document 1, unlike Patent Document 1.

[0099] There are no limitations on the radial width of the retinal non-convergence region and the radial width of the base region as long as they satisfy the above conditions 1 to 3. For example, these values ​​may be within the range of 0.5 to 1.5 mm. These values ​​may be different from each other or may all be the same value. For example, in the examples described below, all of these values ​​are set to 1.0 mm. There are also no limitations on the number of each annular zone as long as they satisfy the above conditions 1 to 3.

[0100] As a guideline, the functional region 3 may be defined as one in which 30% or more (or 40% or more, 50% or more, or 60% or more) of the light flux incident on the wearer's pupil does not converge onto the retina. The larger this percentage value, the greater the effect of inhibiting the progression of myopia or reducing hyperopia is expected to be, but visibility will decrease. The percentage value may be determined appropriately taking into account the balance between the effect of inhibiting the progression of myopia or reducing hyperopia and visibility. The upper limit may be, for example, 70%. Furthermore, when viewed within the functional region and / or the circle, the base region may be set larger than any other non-convergence region.

[0101] In the functional area 3, the area in a planar view of the retinal non-convergence area 3a, which is configured to have the effect of inhibiting the progression of myopia or the effect of reducing hyperopia, may be specified to be 40% or more and 70% or less of the functional area. The retinal non-convergence areas 3a may be arranged so that they become sparser towards the outer edge of the functional area 3. Furthermore, the functional area may include a plurality of retinal non-convergence areas, and two or more types of defocus power may be set in the plurality of retinal non-convergence areas, with the area of ​​each type of defocus power being approximately the same (for example, each area area may be within ±10% of the average area area per number of types).

[0102] There are no limitations on the shape of the functional area 3, and it may be annular in plan view. The ring may be circular, rectangular, elliptical, or a combination thereof on the inside (i.e., the boundary between the central clear area 2 and the functional area 3) and / or the outside (i.e., the boundary between the outer clear area 4 and the functional area 3).

[0103] The spectacle lens 1 of one embodiment of the present invention may be a spectacle lens 1 after being fitted into a frame, and a part of the functional area 3 of the spectacle lens 1 may be in contact with the outer edge of the spectacle lens 1, and another part of the functional area 3 may be in contact with the outer clear area 4. The expression "outer clear area surrounding the functional area" includes this case. Furthermore, it does not preclude the provision of a retinal non-convergence area 3a further toward the outer edge of the outer clear area 4.

[0104] However, in consideration of making it easier to obtain good visibility even in peripheral vision, it is preferable that no configuration intended to have an effect of suppressing the progression of refractive error (e.g., defocus area, convex area and / or concave area, embedded structure, etc.) is provided between the outer edge of the spectacle lens 1 and the functional area 3. In other words, it is preferable that the entire area between the outer edge of the spectacle lens 1 and the functional area 3 be the outer clear area 4.

[0105] It is preferable that no on-retinal non-convergence area 3a is provided in the outer clear area 4 on the outer edge side of the functional area 3 (preferably between the outer edge of the functional area 3 and the outer edge of the spectacle lens 1).

[0106] Regarding the condition 3, when the circle is divided into regions each having a single power, the base region has the largest area, which ensures the effect of the present invention. On the other hand, even if only a small part of the circle does not satisfy the condition 3, the effect of the present invention may still be achieved.

[0107] The effects of the present invention are certainly achieved when all of the above conditions 1 to 3 are satisfied. On the other hand, the effects of the present invention may be achieved even if only a small portion of all the circles does not satisfy at least one of the above conditions 1 to 3.

[0108] For example, the "very small part" is as follows: When a circle with a diameter of 4 mm is placed within the functional area in a planar view, when the circles that can be placed are grouped together, the area (so-called planar area) of the group of circles (excluding overlapping parts in the group) that do not satisfy condition 3 (or at least one of condition 1, condition 2, and condition 3) may be 20% or less of the area of ​​the functional area, with 15% or less, 10% or less, 5% or less, 1% or less, and 0% being preferred in that order.

[0109] In the spectacle lenses described above, by reversing the sign of the defocus power of the non-convergence area on the retina in the above content, the light beam will be focused on the opposite back side (-Z direction) rather than the front side (+Z direction), thereby achieving the effect of reducing hyperopia.

[0110] The matters described as an eyeglass lens, which is one aspect of the present invention, can also be applied to a design method or a manufacturing method of an eyeglass lens. An example is as follows. The following configuration may be combined with other contents described in this specification. "A method for designing or manufacturing a spectacle lens that has the effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; a functional area having an annular shape surrounding the central clear area, the functional area including: a base area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; and a retinal non-convergence area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, while not causing a light beam incident into the wearer's pupil to converge on the retina; an outer clear area which is an area around the functional area and causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the pupil of the wearer, and converge on the retina, thereby realizing the prescribed refractive power of the wearer; A method for designing or manufacturing a spectacle lens, comprising: In a planar view, the base region and the retinal non-convergence region are both annular zones, Each of the retinal non-convergence zones has a spherical shape, A method for designing or manufacturing a spectacle lens, in which, when a circle with a diameter of 4 mm is placed within the functional region in a plan view, any circle that can be placed satisfies the above conditions 1 to 3.

[0111] <One specific example of eyeglass lens 1> The arrangement of the defocus region, which is a non-convergence region on the retina, is not particularly limited and can be determined from the viewpoint of, for example, visibility from outside the defocus region, adding design features to the defocus region, adjusting refractive power using the defocus region, etc. Note that the defocus region is an example of a non-convergence region on the retina, and does not converge the light flux on the retina but converges the light flux in front of the retina (toward the +Z direction).

[0112] Although there is no specific limit to the numerical value of the defocus power in each defocus area, for example, it is preferable that the minimum value of the defocus power provided by the defocus area on the spectacle lens 1 is within the range of 0.50 to 4.50 D and the maximum value is within the range of 3.00 to 10.00 D. The difference between the maximum and minimum values ​​is preferably within the range of 1.00 to 5.00 D.

[0113] The lens substrate is formed of a thermosetting resin material such as thiourethane, allyl, acrylic, or epithio. However, other resin materials that provide the desired refractive index may be selected as the resin material for the lens substrate. Alternatively, the lens substrate may be made of inorganic glass instead of a resin material.

[0114] The hard coat film is formed using, for example, a thermoplastic resin or a UV-curable resin. The hard coat film can be formed by immersing the lens substrate in a hard coat solution, spin coating, or the like. Coating the spectacle lens 1 with such a hard coat film improves the durability of the spectacle lens 1.

[0115] The anti-reflection coating is formed by vacuum deposition of an anti-reflection agent such as ZrO2, MgF2, Al2O3, etc. Coating with such an anti-reflection coating improves the visibility of images passing through the eyeglass lens 1.

[0116] A plurality of defocus regions, which are ring-shaped zones, are formed on the object-side surface of the lens substrate. Therefore, when the object-side surface is covered with a hard coat film and an anti-reflection film, a plurality of defocus regions are also formed by the hard coat film and the anti-reflection film, in imitation of the defocus regions in the lens substrate.

[0117] In manufacturing the eyeglass lens 1, first, a lens substrate is molded by a known molding method such as cast polymerization. For example, by using a mold having a molding surface with the inverted shapes of multiple annular zones, molding by cast polymerization is performed to obtain a lens substrate having a defocus region on at least one surface. Once the lens substrate is obtained, a hard coat film is then formed on the surface of the lens substrate. The hard coat film can be formed by immersing the lens substrate in a hard coat solution, by spin coating, or the like. After the hard coat film is formed, an anti-reflection film is further formed on the surface of the hard coat film by vacuum deposition of the raw materials for the film. By using the manufacturing method with the above procedure, a spectacle lens 1 having a plurality of defocus areas protruding toward the object side on its object side surface can be obtained.

[0118] The thickness of the coating formed through the above steps may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm). However, the thickness of the coating is determined depending on the function required of the coating, and is not limited to the range exemplified above.

[0119] One or more additional coating layers can be formed on the coating layer. Examples of such coating layers include various coating layers such as anti-reflection coatings, water-repellent or hydrophilic anti-fouling coatings, and anti-fogging coatings. Known techniques can be applied to form these coating layers.

[0120] <Glasses> The technical concept of the present invention is also reflected in eyeglasses in which the peripheral portion of the spectacle lens 1 is cut based on a predetermined frame shape and the eyeglasses are fitted into the frame. There are no limitations on the type or shape of the frame, and it may be full-rim, half-rim, under-rim, or rimless.

[0121] Specific examples 1 to 6 of the spectacle lens 1 according to one aspect of the present invention are shown below. The present invention is not limited to the following specific examples.

[0122] <Reference example 1> FIG. 7A is a schematic plan view of a spectacle lens 1 according to Reference Example 1. FIG.

[0123] The following eyeglass lens 10 was manufactured. The eyeglass lens 10 consisted only of a lens substrate, and no other material was laminated onto the lens substrate. The prescribed refractive power was S (spherical refractive power) of 0.00D and C (astigmatic refractive power) of 0.00D. Planar diameter of lens substrate: 60.0 mm Lens material type: PC (polycarbonate) Lens substrate refractive index: 1.589 Shape of the central clear area 2: Planar circular shape (diameter 9.0 mm) centered on the center of the lens (geometric center and eye point) Shape of functional area 3: Area centered on the center of the lens (geometric center and eye point) (diameter 27.0 mm, but annular area excluding clear area 2 on the central side) Arrangement of the retinal non-convergence region (reference example 1) 30 and the base region 3b: Alternately arranged in the radial direction Surface forming the retinal non-convergence area (Reference Example 1) 30: Object-side surface Shape of the retinal non-convergence area (Reference Example 1) 30: spherical and annular in plan view (the inner and outer sides of the annulus are circular) Width of the retinal non-convergence area (Reference Example 1) 30: 1.0 mm Planar shape of the base region 3b: annular in planar view (the inner and outer sides of the ring are circular) Width of base area 3b: 1.0mm -Wearer's pupil diameter: assumed to be 4.0 mm The above content is common to each specific example, so further description will be omitted.

[0124] In Reference Example 1, all of the annular zones that are the on-retinal non-convergence regions (Reference Example 1) 30 have one curvature (corresponding to a defocus power of 3.50D).

[0125] 7B is a graph showing the radial sag value of the eyeglass lens 1 according to Reference Example 1 (vertical axis: sag value, horizontal axis: distance from the lens center). The dotted line shows the plot of the spherical surface forming the power of the central clear region 2, base region 3b, and outer clear region 4. The dashed line shows the plot of the spherical surface forming the power of the on-retinal non-convergence region. The solid line shows the plot for the eyeglass lens 1. "Sag value (h)" refers to the distance from the lens surface to the tangent plane at the center of the lens. In a graph showing sag values ​​such as that shown in FIG. 7B, the dotted lines (plots in the central clear region 2, base region 3b, and outer clear region 4) are plots of a single curve that would be obtained by fitting these regions to the solid line (plot in the spectacle lens 1). Specifically, near the center of the lens, the dotted curve is used as the basis, and when viewed radially, at positions where defocus regions (spherical annular zones) exist, the dashed line plot is moved downward and connected to the solid line to fit the dotted line plot. Then, at positions where the base region 3b exists, the dotted line plot is moved upward and connected to the solid line to fit the dotted line plot. In this way, the solid line (plot in the spectacle lens 1) is formed.

[0126] 7C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis indicated by a white arrow, solid line) and prism power Δ (left vertical axis indicated by a black arrow, dashed line) of the object-side surface of the eyeglass lens 1 according to Reference Example 1. In other diagrams in which the dioptric power D and prism power Δ are on the vertical axis, the white and black arrows are omitted.

[0127] In order to avoid forming a physical step in the functional area 3 on the object-side surface of the spectacle lens 1, the plot of the prism power in Fig. 1C also has a step shape. The behavior of the plot of the prism power in each of the following specific examples is similar.

[0128] The spectacle lens 10 according to Reference Example 1 does not exhibit the effects of the present invention, but is able to fully exert defocusing power that brings about a myopia progression suppression effect, unlike the aspherical shape described in Patent Document 3. The spectacle lens 10 according to Reference Example 1 is a spectacle lens 10 that includes the central clear area 2, the functional area 3, and the outer clear area 4, and in a planar view, the base area 3b and the retinal non-convergence area 30 are both annular zones, the surface shape of each annular zone that is the retinal non-convergence area 30 is part of a sphere centered at a point on the optical axis, and when a circle with a diameter of 4 mm is placed within the functional area 3 in a planar view, any of the circles that can be placed thereon satisfy the conditions 1 and 3 above.

[0129] <Example 1> In the following specific examples 1 and 2, the above-mentioned ii) mode is adopted. That is, a single curvature is set for the annular zone of the retinal non-convergence region, while there are annular zones of the retinal non-convergence region with multiple values ​​of curvature.

[0130] In specific examples 1 and 2, the following configuration was adopted. Defocus power of retinal non-convergence area (curvature α) 3aα: 4.50D Defocus power of retinal non-convergence area (curvature β) 3aβ: 2.50D Arrangement order of retinal non-convergence areas: From the side closest to the center of the lens, the order is: ring of retinal non-convergence area 3aα → ring of base area 3b → ring of retinal non-convergence area 3aβ → ring of base area 3b → ring of retinal non-convergence area 3aα → ring of base area 3b → ring of retinal non-convergence area 3aβ → ring of base area 3b → ring of retinal non-convergence area 3aα → ring of base area 3b → ring of retinal non-convergence area 3aβ.

[0131] FIG. 1A is a schematic plan view of specific examples 1 and 2 of a spectacle lens 1 according to one embodiment of the present invention. 1B is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) for specific example 1 of eyeglass lens 1 according to one embodiment of the present invention. Dotted lines indicate plots for central clear region 2, base region 3b, and outer clear region 4. Dashed lines indicate plots for retinal non-convergence region 3aα. Two-dot chain lines indicate plots for retinal non-convergence region 3aβ. Solid lines indicate plots for eyeglass lens 1. FIG. 1C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 1 of eyeglass lens 1 according to one embodiment of the present invention.

[0132] <Example 2> 2A is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) for specific example 2 of eyeglass lens 1 according to one embodiment of the present invention. Dotted lines indicate plots for central clear region 2, base region 3b, and outer clear region 4. Dashed lines indicate plots for retinal non-convergence region 3aα. Two-dot chain lines indicate plots for retinal non-convergence region 3aβ. Solid lines indicate plots for eyeglass lens 1. FIG. 2B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 2 of eyeglass lens 1 according to one embodiment of the present invention.

[0133] <Example 3> In the following specific examples 3 to 6, the preferred example of i) above is adopted, that is, in each annular zone of the retinal non-convergence region, spherical surfaces with different curvatures are connected on the side closer to the lens center and the side farther from it in the radial direction.

[0134] In specific examples 3 and 4, the following configuration was adopted. Defocus power of retinal non-convergence area (part 1) 3a1: 4.50D Defocus power of retinal non-convergence area (part 2) 3a2: 2.50D Spherical connection: The retinal non-convergence area (part 1) 3a1 is located closer to the lens center in the radial direction, and the retinal non-convergence area (part 2) 3a2 is located farther away. Connection point: The center position of the retinal non-convergence area when viewed in the radial direction (0.5 mm from the side closest to the center of the lens to the side farther from the center of the retinal non-convergence area)

[0135] FIG. 3A is a schematic plan view of specific examples 3 and 4 of the eyeglass lens 1 according to one embodiment of the present invention. 3B is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) in specific example 3 of eyeglass lens 1 according to one embodiment of the present invention. Dotted lines indicate plots in the central clear region 2, base region 3b, and outer clear region 4. Dashed lines indicate plots in retinal non-convergence region (part 1) 3a1. Two-dot chain lines indicate plots in retinal non-convergence region (part 2) 3a2. Solid lines indicate plots in eyeglass lens 1. FIG. 3C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 3 of eyeglass lens 1 according to one embodiment of the present invention.

[0136] <Example 4> 4A is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) in specific example 4 of a spectacle lens 1 according to one embodiment of the present invention. The dotted lines indicate plots in the central clear region 2, base region 3b, and outer clear region 4. The dashed lines indicate plots in the retinal non-convergence region (part 1) 3a1. The two-dot chain line indicates plots in the retinal non-convergence region (part 2) 3a2. The solid line indicates plots in the spectacle lens 1. FIG. 4B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 4 of eyeglass lens 1 according to an embodiment of the present invention.

[0137] <Example 5> In Examples 5 and 6, the following configuration was adopted. Defocus power of retinal non-convergence area (part 1) 3a1: 4.50D Defocus power of retinal non-convergence area (part 2) 3a2: 3.50D Defocus power of retinal non-convergence area (part 3) 3a3: 2.50D Spherical connection: When viewed radially, the retinal non-convergence area (part 1) 3a1 is located closer to the lens center, the retinal non-convergence area (part 2) 3a2 is located in the middle, and the retinal non-convergence area (part 3) 3a3 is located farther away. The connection point between the retinal non-convergence area (part 1) 3a1 and the retinal non-convergence area (part 2) 3a2: the point 0.33 mm from the side of the retinal non-convergence area closest to the center of the lens toward the side farther from the center of the lens when viewed in the radial direction. The connection point between the retinal non-convergence area (part 2) 3a2 and the retinal non-convergence area (part 3) 3a3: the point 0.33 mm from the side of the retinal non-convergence area away from the center of the lens toward the center of the lens when viewed in the radial direction. That is, the retinal non-convergence area (part 2) 3a2 with the greatest defocus power is placed at the center position in the radial direction of each annular zone, which is the retinal non-convergence area.

[0138] FIG. 5A is a schematic plan view of specific examples 5 and 6 of the eyeglass lens 1 according to one embodiment of the present invention. 5B is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) in specific example 5 of eyeglass lens 1 according to one embodiment of the present invention. Dotted lines indicate plots in the central clear region 2, base region 3b, and outer clear region 4. Dashed lines indicate plots in retinal non-convergence region (part 1) 3a1. Two-dot chain lines indicate plots in retinal non-convergence region (part 2) 3a2. Long dashed lines indicate plots in retinal non-convergence region (part 3) 3a3. Solid lines indicate plots in eyeglass lens 1. FIG. 5C is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism dioptric power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 5 of eyeglass lens 1 according to an embodiment of the present invention.

[0139] 6A is a graph showing the sag value (vertical axis: sag value, horizontal axis: distance from the lens center) in specific example 6 of a spectacle lens 1 according to an embodiment of the present invention. The dotted lines indicate plots in the central clear region 2, base region 3b, and outer clear region 4. The dashed lines indicate plots in the retinal non-convergence region (part 1) 3a1. The two-dot chain line indicates plots in the retinal non-convergence region (part 2) 3a2. The long dashed line indicates plots in the retinal non-convergence region (part 3) 3a3. The solid lines indicate plots in the spectacle lens 1. FIG. 6B is a graph (horizontal axis: distance from the lens center) showing the dioptric power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed dotted line) of the object-side surface of specific example 6 of eyeglass lens 1 according to an embodiment of the present invention.

[0140] The technical scope of the present invention is not limited to the above-described embodiments, but includes various modifications and improvements within the scope of the specific effects obtained by the constituent elements of the invention and their combinations. For example, the present invention is applicable not only to spectacle lenses but also to other ophthalmic lenses (e.g., contact lenses and intraocular lenses (for phakic or aphakic patients)). [Explanation of symbols]

[0141] 1. Eyeglass lenses 2. Clear area on the central side 3. Functional Area 3aα...Retinal non-convergence area (curvature α) 3aβ...Retinal non-convergence area (curvature β) 3a1 Retinal non-convergence area (part 1) 3a2 Retinal non-convergence area (part 2) 3a3 Retinal non-convergence area (part 3) 3b Base region 4. Outer clear area 10. Eyeglass lenses (Reference example 1) 30. Retinal non-convergence area (Reference Example 1)

Claims

1. A spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; a functional area having an annular shape surrounding the central clear area, the functional area including: a base area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the wearer's prescribed refractive power; and a retinal non-convergence area for causing a light beam incident from the object-side surface to exit from the eyeball-side surface, while not causing a light beam incident into the wearer's pupil to converge on the retina; An outer clear area is an area around the functional area, and causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby achieving the wearer's prescribed refractive power; Equipped with In a planar view, the base region and the retinal non-convergence region are both annular zones, Each of the retinal non-convergence zones has a spherical shape, A spectacle lens that, when viewed in a plane, satisfies the following conditions for any circle that can be placed within the functional region, the circle having a diameter of 4 mm. <Condition 1> Within the circle are the base region and the epiretinal non-convergence region. <Condition 2> The retinal non-convergence region within the circle has a plurality of locations with different curvatures. <Condition 3> When the inside of the circle is divided into regions each having a single power, the base region has the largest area.

2. Any one of the following conditions i) to iii) is satisfied, and 2. The eyeglass lens according to claim 1, wherein the surface shape of each annular zone, which is the non-convergence area on the retina that satisfies i) or iii), is a shape formed by arranging spherical surfaces having mutually different curvatures side by side in the radial direction. i) The surface shape of each annular zone, which is the non-convergence area on the retina, has multiple types of numerical curvature, and annular zones with different curvatures exist within the circle, thereby satisfying condition 2. ii) The surface shape of each annular zone that is the retinal non-convergence region has a single numerical value of curvature, and condition 2 is satisfied by the presence of a plurality of annular zones with different curvatures within the circle. iii) The surface shape of each annular zone, which is the retinal non-convergence area, has multiple types of numerical curvature or a single numerical curvature, and satisfies condition 2 by having parts within the circle with different curvatures.

3. Satisfies i) or iii), and The difference in curvature of the surface shape within each annular zone, which is the retinal non-convergence region, becomes equal or smaller in the radial direction away from the lens center, and 3. The eyeglass lens according to claim 2, wherein, of the zones that are the non-convergence regions on the retina, the difference in curvature of the surface shape within the zone that is farthest from the lens center is smaller than the difference in curvature of the surface shape within the zone that is closest to the lens center.

4. Satisfies i) or iii), and 3. The eyeglass lens according to claim 2, wherein, within each annular zone that is the non-convergence region on the retina, the curvature of the surface shape on the side farthest from the lens center is greater than the curvature of the surface shape on the side closest to the lens center.

5. 3. The eyeglass lens according to claim 2, wherein the number of different types of curvature values ​​is two to four.

6. The eyeglass lens according to claim 5 , wherein, within each of the annular zones that are the non-convergence regions on the retina, spherical surfaces with a larger curvature are arranged, among the different curvatures, the closer to the center the spherical surfaces are.

7. The eyeglass lens according to claim 1 , wherein the difference between the mutually different curvatures in said condition 2 is 0.25 D or more.

8. 2. The eyeglass lens according to claim 1, wherein, in a plan view, the functional area falls within a circle having the eye point as its center and a diameter of any one value between 15.00 mm and 32.00 mm.

9. The spectacle lens according to any one of claims 1 to 8, which has an effect of inhibiting the progression of myopia.

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