Eyeglass lens

Abstract

Provided is an eyeglass lens that exerts an effect of suppressing progression of myopia or an effect of reducing hyperopia, and has a center-side clear area, a functional area, and an outer-side clear area, both the base area and the retinal non-converging area are annular zones in plan view, each annular zone as the retinal non-converging area is spherical in shape, and when a circle with a diameter of 4 mm is disposed in the functional area in plan view, conditions 1 to 3 are satisfied in any circle that can be disposed.

Description

Technical Field

[0001] This invention relates to spectacle lenses. Background Technology

[0002] As a spectacle lens for inhibiting the development of refractive errors such as myopia, there is a type of lens in which multiple island-shaped regions are formed on the lens, and these island-shaped regions have a more correct refractive power than the prescription refractive power (for example, see Patent Document 1).

[0003] According to this type of eyeglass lens, in a light beam that enters from the object-side surface and exits from the eye-side surface, the light beam that passes through the area outside the defocus region is focused on the wearer's retina, while the light beam that passes through the defocus region is focused at a position further forward than the retina, thereby inhibiting the development of myopia.

[0004] Patent document 2 discloses an eyeglass lens configured to form a Fresnel lens-like pattern.

[0005] In Patent Document 2

[0036] , a “Fresnel lens pattern” is defined as a pattern in which a “spherical” shape is divided into multiple concentric rings and arranged in a stepped manner in a cross-sectional view.

[0006] Patent Document 3

[0008] describes a spectacle lens in which multiple annular columnar microstructures of different radii on the outer side of the central optical region provide relatively stable refractive power and astigmatism. Providing the aforementioned refractive power and astigmatism means that, as shown in Figures 2 and 4 of Patent Document 3, each annular band is aspherical.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: U.S. Patent Application Publication No. 2017 / 0131567

[0010] Patent Document 2: Text of WO2020 / 045567

[0011] Patent Document 3: Chinese Patent No. 111103701 Summary of the Invention

[0012] The problem the invention aims to solve

[0013] In the Fresnel lens-like pattern described in Figure 7 of Patent Document 2, both the sawtooth portion at position A on the retina and the sawtooth portion at position B, which converges light rays to a position closer to the object than position A, are spherical. This means that two images with different magnifications can be formed.

[0014] Suppose a wearer observes a near object using the spectacle lenses described in Patent Document 2. In this case, when observing a near object, due to the reciprocal of refractive power (ratio of power to distance), a greater refractive power is required compared to observing a distant object. As a result, although the serrated portion, originally designed to achieve defocusing, has a greater optical power than the portion that focuses the light beam on position A on the retina, this serrated portion may still cause near objects to be well-imaged. That is, the serrated portion may cause the light beam to focus on position A on the retina. Thus, the serrated portion, which should focus the light beam on position A on the retina, instead causes the light beam to focus further back than the retina (so-called underfocus). This may lead to the opposite effect of inhibiting myopia development, potentially promoting myopia progression.

[0015] As described in Patent Document 3, if the serrated portion is made aspherical, the light beam passing through this aspherical portion is less likely to converge compared to the case of a spherical portion, making it less likely for the wearer to perceive ghosting. As a result, the image that should have been obtained can be obtained through the portion without the aspherical portion (the so-called base region), which is its advantage. On the other hand, because it is aspherical, the light is less likely to converge at position B, which is closer to the object than position A. As a result, the defocus power that should have been obtained cannot be fully utilized.

[0016] One aspect of the present invention is to provide a technique that, in the case of ghosting generated by an annular base region and an annular non-converging region of the light beam, makes it easy for the image generated by the base region to be imaged onto the wearer's retina, and allows the defocus power that has the effect of inhibiting the development of myopia or reducing hyperopia to be fully utilized.

[0017] Technical solutions to the problem

[0018] The inventors have discovered a structure in which at least one annulus, which provides defocus optical power and is described later as a non-converging region on the retina, exists at least partially within an arbitrary circle of pupil diameter (3-6 mm, for example, 4 mm) when viewed from above. Furthermore, each annulus, serving as a non-converging region on the retina, is spherical in shape. As an example, the surface shape of each annulus serving as a non-converging region on the retina is a portion of a sphere centered on a point on the optical axis. Based on this, within each pupil diameter circle, there exist spherical non-converging regions on the retina with mutually different defocus optical powers.

[0019] Assume the lens has a ring of base power, and rings of defocus power 1 and defocus power 2. When the wearer observes near the retina, an image can be formed on the retina regardless of which of these three powers is used. The other two powers form a blurred image on the retina. The final power used can be considered to depend on the brightness of the image formed on the retina. If we set it so that within any circle of the pupil diameter (3-6 mm, e.g., 4 mm), the area of ​​the ring of base power is larger than either defocus power 1 or defocus power 2, then the image produced by base power is the brightest. Therefore, the wearer naturally sees the image formed by base power, while defocus power 1 and defocus power 2 provide defocus stimulation to the retina. Through this mechanism, in the context of ghosting caused by the ring-shaped base region and the ring-shaped non-converging beam region, the image produced by the base region becomes easier to image on the wearer's retina. Furthermore, the definitions of "defocus power" and "base power" mentioned here will be described later.

[0020] Based on the above findings, the specific solution of the present invention is as follows.

[0021] The first aspect of the present invention is as follows:

[0022] A type of eyeglass lens that inhibits the progression of myopia or reduces hyperopia has the following characteristics:

[0023] The central clear area, which includes the eyepoint, allows light rays entering from the object's side to exit from the eye's side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0024] The functional region, a ring-shaped area surrounding the centrally clear region, has a basal region and a supraretinal non-converging region. The basal region allows light rays incident from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. The supraretinal non-converging region allows light rays incident from the object-side surface to exit from the eye-side surface, but prevents the light rays entering the wearer's pupil from converging on the retina.

[0025] The outer clear region, which is the area surrounding the functional region, allows light rays entering from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0026] When viewed from above, both the basal region and the non-converging region on the retina appear as rings.

[0027] The rings that constitute the non-converging regions on the retina are spherical in shape.

[0028] When viewed from above, if a circle with a diameter of 4 mm is arranged within the functional area, the following condition is satisfied in any configurable circle:

[0029] <Condition 1>

[0030] The circle contains the basal region and the non-converging region on the retina.

[0031] <Condition 2>

[0032] Within the non-converging region of the retina existing within the circle, there are multiple locations with different curvatures.

[0033] <Condition 3>

[0034] When the circle is divided into regions with a certain degree, the base region has the largest area.

[0035] The second aspect of the present invention is as follows:

[0036] According to the first method, the spectacle lens satisfies any one of the following i) to iii), and,

[0037] The shape of each annulus, which is a non-converging region on the retina, satisfying i) or iii), is formed by radially arranged spherical surfaces with different curvatures.

[0038] i) The surface shape of each annulus, which is a non-converging region on the retina, has a curvature with multiple values, and there are annulus bands with different curvatures within the circle, thereby satisfying condition 2.

[0039] ii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a certain curvature and having multiple annulus with different curvatures within the circle.

[0040] iii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a curvature of multiple values ​​or a curvature of one value, and by having portions of different curvatures within the circle.

[0041] The third aspect of the present invention is:

[0042] According to the second method, the spectacle lens satisfies either i) or iii), and...

[0043] In the radial direction away from the center of the lens, the curvature difference of the surface shape within each annulus, which is a non-converging region on the retina, is equal or decreases, and...

[0044] In each ring that is a non-converging region on the retina, the curvature difference of the surface shape in the ring furthest from the center of the lens is smaller than the curvature difference of the surface shape in the ring closest to the center of the lens.

[0045] The fourth aspect of the present invention is:

[0046] The spectacle lens according to any of the second to third methods satisfies either i) or iii), and...

[0047] Within each ring that constitutes a non-converging region on the retina, the curvature of the surface shape furthest from the center of the lens is greater than the curvature of the surface shape closest to the center of the lens.

[0048] The fifth aspect of the present invention is:

[0049] According to any one of the second to fourth methods, the number of different curvature values ​​of the eyeglass lens is 2 to 4.

[0050] The sixth aspect of this invention is:

[0051] In any of the second to fifth methods, within each annulus that constitutes a non-converging region on the retina, a spherical surface is arranged with a greater curvature closer to the center among the different curvatures.

[0052] The seventh aspect of the present invention is:

[0053] According to any one of the first to sixth methods, in condition 2, the curvature difference between the different lenses is 0.25D or more.

[0054] The eighth aspect of the present invention is:

[0055] According to any one of the first to seventh embodiments, when viewed from above, the functional area is housed within a circle centered on the eye point and having a diameter of any value between 15.00 and 32.00 mm.

[0056] The ninth aspect of the present invention is:

[0057] The spectacle lens described in any of the first to eighth methods has the effect of inhibiting the development of myopia.

[0058] Other embodiments of the present invention that can be combined with the above-described methods are as follows.

[0059] In one aspect of the invention, the central clear region (and the base region within the functional region, and further the outer clear region) functions as a so-called monofocal lens.

[0060] When viewed from above, when a circle with a diameter of 4 mm is arranged within the functional area, when the configurable circles are grouped together, the area of ​​the group of circles satisfying conditions 1 to 3 (excluding duplicate parts in the group) (the so-called top-view area) can be 80% or more relative to the area of ​​the functional area, and preferably 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, and 100% in sequence.

[0061] When viewed from above, the area of ​​the non-converging region on the retina within the functional area is preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% or more, respectively, relative to the area of ​​the non-converging region on the retina in the entire spectacle lens.

[0062] There are no limitations on the size and shape of the centrally clear area 2. Regarding the shape, the outline of the functional area closest to the center of the lens directly constitutes the shape of the centrally clear area. As a reference for the lower limit of the size of the centrally clear area 2, it can be a size that can contain a circle with a diameter of 6.00 mm centered on the eyepoint. As a reference for the upper limit of the size of the centrally clear area 2, it can be a size that can be contained within a circle with a diameter of 13.00 mm centered on the eyepoint.

[0063] For reference, the functional region can be defined as a region where more than 30% (or 40%, 50%, or 60%) of the light beam entering the wearer's pupil does not converge onto the retina. An upper limit could be, for example, 70%. Furthermore, when observing within the functional region and / or the circle described above, the basal region can be set larger than any other non-converging region.

[0064] Furthermore, within the functional region, the area of ​​the supraretinal non-convergent region, which serves as a structure to inhibit myopia progression or reduce hyperopia, when viewed from above, can be specified to be between 20% and 80% of the total functional region. The supraretinal non-convergent region can also be configured to become sparse towards the outer edge of the functional region. Moreover, the functional region can contain multiple supraretinal non-convergent regions, with two or more defocus powers set within these multiple supraretinal non-convergent regions, and the area of ​​each type of defocus power can be approximately the same (e.g., the area of ​​each region is within ±10% of the average area of ​​each type).

[0065] However, considering the ease of achieving good visual recognition in the peripheral field of vision, it is preferable to avoid having structures (e.g., defocus areas, convex and / or concave areas, embedded structures, etc.) between the outer edge of the spectacle lens and the functional area that are intended to suppress the development of refractive errors. In other words, it is preferable that the entire area between the outer edge of the spectacle lens and the functional area is a clear outer region.

[0066] The radial widths of the non-converging regions on the retina within the functional region and the radial widths of the basal region are not limited as long as conditions 1 to 3 are met. As an example of these values, they can be in the range of 0.5 to 1.5 mm. These values ​​can be different from each other or all the same. For example, in the embodiment described later, all these values ​​(i.e., the radial widths of the non-converging regions on the retina within the functional region and the radial widths of the basal region) are 1.0 mm. Furthermore, the number of each annulus is not limited as long as conditions 1 to 3 are met.

[0067] Regarding condition 3, when the circle is divided into regions with a certain degree, the effects of the invention can be reliably achieved as long as the base region has the largest area. On the other hand, the effects of the invention may still be achieved even if only a small portion of all the circles does not satisfy condition 3.

[0068] The effects of the present invention can be reliably achieved as long as all of conditions 1 to 3 are satisfied. On the other hand, the effects of the present invention may still be achieved even if only a small portion of all the circles does not satisfy at least one of conditions 1 to 3.

[0069] For example, the “small part” is described below.

[0070] When viewed from above, when a circle with a diameter of 4 mm is arranged in the functional area, when the configurable circles are grouped together, the area of ​​the group of circles that do not satisfy condition 3 (excluding the duplicate parts in the group) (the so-called top view area) can be less than 20% of the area of ​​the functional area, and preferably less than 15%, less than 10%, less than 5%, less than 1%, and 0% in sequence.

[0071] In the aforementioned spectacle lenses, by reversing the sign of the defocus power of the non-converging region on the retina, the light beam is focused not on the near side (+Z direction) but on its opposite side (-Z direction), thereby reducing farsightedness.

[0072] The description of the spectacle lens as one aspect of the present invention can also be applied to the design or manufacturing methods of spectacle lenses. One example is described below. Other contents described in this specification can be combined with the following structures.

[0073] "A method for designing or manufacturing an eyeglass lens, wherein the eyeglass lens has the effect of inhibiting the progression of myopia or reducing the effect of hyperopia, and has the following characteristics: "

[0074] The central clear area, which includes the eyepoint, allows light rays entering from the object's side to exit from the eye's side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0075] The functional region, a ring-shaped area surrounding the centrally clear region, has a basal region and a supraretinal non-converging region. The basal region allows light rays incident from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. The supraretinal non-converging region allows light rays incident from the object-side surface to exit from the eye-side surface, but prevents the light rays entering the wearer's pupil from converging on the retina.

[0076] The outer clear region, which is the area surrounding the functional region, allows light rays entering from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0077] When viewed from above, both the basal region and the non-converging region on the retina appear as rings.

[0078] The rings that constitute the non-converging regions on the retina are spherical in shape.

[0079] When viewed from above, if a circle with a diameter of 4 mm is arranged within the functional area, conditions 1 to 3 above are satisfied in any arrangable circle.

[0080] The technical concept of the present invention is also reflected in the pair of eyeglass lenses in which one aspect of the present invention is applied to the right eye lens and the left eye lens, respectively.

[0081] The technical concept of this invention is also reflected in eyeglasses in which the lenses are cut near the periphery of the frame based on a prescribed frame shape and then embedded in the frame.

[0082] Invention Effects

[0083] According to one aspect of the present invention, a technique is provided that, when wearing eyeglass lenses with clear and functional areas, good visual recognition can also be easily obtained in the peripheral field of vision. Attached Figure Description

[0084] Figure 1A This is a schematic top view of specific examples 1 and 2 of the spectacle lens involved in one aspect of the present invention.

[0085] Figure 1B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 1 of the spectacle lens involved in one aspect of the present invention.

[0086] Figure 1C This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 1 of the spectacle lens involved in one aspect of the present invention.

[0087] Figure 2A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 2 of the spectacle lens involved in one aspect of the present invention.

[0088] Figure 2B This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 2 of the spectacle lens involved in one aspect of the present invention.

[0089] Figure 3A These are schematic top views of specific examples 3 and 4 of the spectacle lenses involved in one aspect of the present invention.

[0090] Figure 3B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 3 of the spectacle lens involved in one aspect of the present invention.

[0091] Figure 3C This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 3 of the spectacle lens involved in one aspect of the present invention.

[0092] Figure 4A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 4 of the spectacle lens involved in one aspect of the present invention.

[0093] Figure 4B This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 4 of the spectacle lens involved in one aspect of the present invention.

[0094] Figure 5A These are schematic top views of specific examples 5 and 6 of the spectacle lenses involved in one aspect of the present invention.

[0095] Figure 5B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 5 of the spectacle lens involved in one aspect of the present invention.

[0096] Figure 5CThis is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 5 of the spectacle lens involved in one aspect of the present invention.

[0097] Figure 6A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 6 of the spectacle lens involved in one aspect of the present invention.

[0098] Figure 6B This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface in a specific example 6 of the spectacle lens involved in one aspect of the present invention.

[0099] Figure 7A This is a schematic top view of the eyeglass lens involved in Example 1.

[0100] Figure 7B This is a graph showing the sagittal values ​​in the spectacle lens involved in Reference Example 1 (vertical axis: sagittal value, horizontal axis: distance from the center of the lens).

[0101] Figure 7C This is a graph showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object-side surface in the eyeglass lens involved in Reference Example 1 (horizontal axis: distance from the center of the lens). Detailed Implementation

[0102] The embodiments of the present invention will now be described. The following description, based on the accompanying drawings, is illustrative, and the present invention is not limited to the exemplary embodiments.

[0103] The spectacle lenses described in this specification have an object-side surface and an eye-side surface. "Object-side surface" refers to the surface located on the object side when the eyeglasses with the spectacle lenses are worn by the wearer, and "eye-side surface" refers to the opposite, i.e., the surface located on the eye-side when the eyeglasses with the spectacle lenses are worn by the wearer. This relationship also applies to the lens substrate, which serves as the basis for the spectacle lenses. That is, the lens substrate also has an object-side surface and an eye-side surface. In one embodiment of the invention, the object-side surface is convex, and the eye-side surface is concave. That is, in one embodiment of the invention, the spectacle lens is a meniscus lens.

[0104] The spectacle lens involved in one aspect of the present invention, like the spectacle lens described in Patent Document 1, is a myopia progression inhibition lens. However, the spectacle lens involved in one aspect of the present invention is not limited to this. For example, the spectacle lens involved in one aspect of the present invention could also be a hyperopia reduction lens. Furthermore, myopia progression inhibition and hyperopia reduction inhibition are collectively referred to as refractive error development inhibition.

[0105] In this instruction manual, the horizontal direction when wearing eyeglass lenses is defined as the X direction, the vertical (up and down) direction as the Y direction, and the thickness direction of the eyeglass lens, perpendicular to both 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 center of the lens. Furthermore, the lens center refers to the optical or geometric center of the eyeglass lens. This instruction manual provides examples where the optical and geometric centers are approximately aligned.

[0106] The direction facing the wearer is defined as +X, left, +Y, and -Y. The direction facing the object (near-forward) is defined as +Z, and the opposite direction (depth) is defined as -Z. These near-forward and depth directions refer to the direction of the light beam passing through the center of the pupil. Although strictly speaking, XY coordinates should also be considered when observing the surroundings, these definitions are used for ease of explanation in this manual. In this manual, "looking down" refers to the state of observation from the +Z direction towards the -Z direction.

[0107] The direction extending radially from the center of the lens is defined as the +r direction, and the circumferential direction perpendicular to the r direction is defined as the θ direction.

[0108] Furthermore, when a functional area is provided only on the outermost surface of the eyeball, it is acceptable to view from the -Z direction toward the +Z direction as a top-down view. Hereafter, when discussing the "position" of the eyepoint and geometric center in eyeglass lenses, unless otherwise specified, the position refers to the top-down view.

[0109] In this specification, “~” indicates values ​​above and below the specified value.

[0110] <Eyeglass lenses>

[0111] One aspect of the present invention relates to an eyeglass lens having a central clear region, a functional region, and an outer clear region.

[0112] The centrally clear region is a portion with a smooth surface shape from a geometrical optical point of view that enables the wearer to achieve the prescribed refractive power, for example, a portion that is transparent in the visible light wavelength region. The centrally clear region corresponds to the first refractive region of Patent Document 1.

[0113] In addition, the central clear area is the area including the center of the lens and / or the eye point, which is the area where a light beam entering from the object side exits from the eye side side and enters the wearer's pupil, converging on the retina.

[0114] Through a centrally clear region according to one aspect of the present invention, a prescription power (spherical power, astigmatism power, astigmatism axis, etc.) can be achieved. The spherical power can be the power that should be corrected when viewed from the front (at an infinity distance to about 1m from the object) (e.g., distance power, hereinafter using distance power as an example), or it can be the power that should be corrected when viewed from an intermediate distance (1m to 40cm) or a near-side view (40cm to 10cm).

[0115] Furthermore, no structures (e.g., defocused areas, convex and / or concave areas, embedded structures, etc.) are provided in the central clear area to suppress the development of refractive abnormalities.

[0116] In one aspect of the invention, the central clear region (and the base region within the functional region, and further the outer clear region) functions as a so-called monofocal lens.

[0117] Incidentally, the prescription data containing the wearer's information is recorded on the lens pouch of the eyeglasses. That is to say, as long as there is a lens pouch, the item used as an eyeglass lens can be identified based on the prescription data containing the wearer's information. Furthermore, eyeglasses lenses are usually sold as a set with lens pouches. Therefore, eyeglasses with accompanying lens pouches can also reflect the technical concept of this invention, and the same applies to the set of lens pouches and eyeglasses lenses.

[0118] "Eye point" refers to the position through which the line of sight passes when looking directly forward, for example, when wearing eyeglass lenses. The eye point can also be the position through which the line of sight passes when the wearer observes an object close to them (so-called near-side observation), i.e., the near-side eye point. In one aspect of the invention, an example is provided where the geometric center of the eyeglass lens before being processed for frame assembly coincides with the eye point, the prism reference point, and the center of the lens. The following example of an eyeglass lens before frame assembly is provided as one aspect of the invention, but the invention is not limited to this approach.

[0119] The location of the eye point can be determined by referring to the remark chart or center chart issued by the lens manufacturer.

[0120] A functional zone is a region that allows light rays entering from the object's side to exit from the eye's side, but prevents at least a portion of the light rays entering the wearer's pupil from converging on the retina. In a top view, the functional zone is a ring-shaped area adjacent to and surrounding the central region of focus.

[0121] The outer ring of clear light surrounding the functional area on the outer edge of the spectacle lens allows light rays entering from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina. In other words, the functional area is a ring-shaped region existing between the outer and central clear areas.

[0122] The functional region sandwiched between the outer clear region and the central clear region consists of the non-converging region and the basal region on the retina.

[0123] The basal region performs the same function as the central clear region (and the lateral clear region described later). In one embodiment of the invention, the area outside the basal region in the functional regions is a non-converging region on the retina.

[0124] The non-converging region on the retina is the area that prevents light beams entering the wearer's pupil from converging on the retina. It is a region with a different refractive power than the basal region.

[0125] In one embodiment of the invention, both the basal region and the non-converging region on the retina within the functional area are annular rings. The top-view shape of the annular ring is not limited; the inner (outline closer to the lens center) and / or outer (outline farther from the lens center) of the annular ring can be a perfect circle, ellipse, rectangle, etc. As one embodiment of the invention, an example is provided where the basal region and the non-converging region on the retina are concentric with the lens center and the inner and outer outlines are perfect circles. (The following will be discussed further.) Figure 1A , Figure 3A , Figure 5A , Figure 7A The dashed circle in the diagram corresponds to the perfect circle.

[0126] In one embodiment of the invention, the annulus, which is a non-converging region on the retina, and the annulus, which is a basal region, are arranged alternately in the radial direction.

[0127] Alternatively, the area between the ring of the smallest diameter non-converging region on the retina and the ring of the largest diameter non-converging region on the retina (including both rings) can be defined as a functional region.

[0128] In one embodiment of the present invention, the shape of each annular zone, which is a non-converging region on the retina, is part of a sphere centered at a point on the optical axis. In other words, each annular zone, which is a non-converging region on the retina, is spherical in shape. With this structure, unlike the technology described in Patent Document 3, defocus power can be fully utilized.

[0129] In this specification, "defocus power" refers to the difference between the refractive power of each non-converging region (in other words, the defocus region) on the retina and the refractive power of the portion outside the defocus region (also known as basal power). In other words, "defocus power" is the difference obtained by subtracting the refractive power of the basal portion (basal region, central clear region, and lateral clear region) from the average of the minimum and maximum refractive powers at specified locations on the non-converging region of the retina.

[0130] In this specification, "refractive power" refers to the average refractive power, which is the average of the refractive power in the direction where the refractive power is at its minimum and the refractive power in the direction where the refractive power is at its maximum (relative to the direction perpendicular to that direction).

[0131] In one aspect of the spectacle lens according to the present invention, each annulus, which is a non-converging region on the retina, is spherical. Therefore, the correspondence between defocus power and the curvature of this sphere is clear. In this specification, the term "curvature" is sometimes used to describe defocus power, and conversely, curvature is sometimes referred to as defocus power.

[0132] In one aspect of the present invention, when viewing from above, if a circle with a diameter of 4 mm is arranged in the functional area, the following condition is satisfied in any configurable circle.

[0133] <Condition 1>

[0134] The circle contains the basal region and the non-converging region on the retina.

[0135] <Condition 2>

[0136] Within the non-converging region of the retina existing within the circle, there are multiple locations with different curvatures.

[0137] <Condition 3>

[0138] When the circle is divided into regions with a certain degree, the base region has the largest area.

[0139] Furthermore, the 4mm diameter circle is assumed to represent the pupil diameter. (The following is a separate section...) Figure 1A , Figure 3A , Figure 5A , Figure 7A The circle indicated by the dashed line corresponds to this circle. Alternatively, considering pupil diameter variation and individual differences, a circle with a value in the range of 3–6 mm can be used instead of a circle with a diameter of 4 mm.

[0140] By satisfying condition 1, the non-converging region on the retina can be used to inhibit the progression of myopia, and from a geometrical optical point of view, the wearer's prescription refractive power can be achieved using the basal region. Furthermore, it is sufficient that the ring, which constitutes the non-converging region on the retina, partially exists within this circle.

[0141] By satisfying condition 2, non-converging regions on the retina, each with a different curvature (i.e., defocus power), can exist within the pupil diameter. With this structure, assuming the wearer is observing near, even if an image appears to be formed on the retina due to defocus power 1, the amount of light in the blurred image caused by defocus power 2 and the base power is large, resulting in the wearer not seeing an image formed by the non-converging regions on the retina. Therefore, the effect of inhibiting myopia progression can be maintained.

[0142] By satisfying condition 3, the wearer can naturally see the brightest image formed by the largest base optical power area, and the non-converging area on the retina can bring about the effect of inhibiting the development of refractive abnormalities.

[0143] Through the above mechanism, in the ghosting produced by the annular base region and the annular non-converging beam region, the image produced by the base region becomes easier to image onto the wearer's retina.

[0144] As a result, according to one aspect of the invention, a technique can be provided that allows for good visual recognition even in the peripheral field of vision when wearing eyeglass lenses with clear and functional areas.

[0145] <Preferred and modified examples of spectacle lens 1>

[0146] Preferred examples and variations of the spectacle lens 1 in one aspect of the present invention will be described below.

[0147] The condition 2, "within the circle, in the non-converging region on the retina, there are multiple locations with different curvatures," can be broadly categorized into three types. These three types are described below (i) to (iii).

[0148] i) The surface shape of each annulus, which is a non-converging region on the retina, has a curvature with multiple values, and there exist annulus whose inner surface shapes have different curvatures, thereby satisfying condition 2. This item corresponds to embodiments 3 to 6 described later. Unless otherwise specified, this item is illustrated below.

[0149] "The surface shape of each annulus has a curvature of multiple values" means that each annulus, which is a non-converging region on the retina, is composed of multiple sub-annulus connected side by side in the radial direction (e.g., non-converging regions on the retina (1), (2), and (3) described later). These multiple sub-annulus have different defocus powers. The surface shape of each sub-annulus is a part of a sphere centered at a point on the optical axis.

[0150] The connection can be made in the following manner. That is, the surface shape of each ring that serves as a non-converging region on the retina, satisfying i) or iii) described below, can also be a shape formed by connecting spherical surfaces with different curvatures. An example of this is given below.

[0151] Furthermore, in this embodiment, the curvature of the surface shape is different within a ring that is a non-converging region on the retina. Therefore, in this embodiment, as long as at least one non-converging region on the retina exists within the circle, the condition 2, "there are multiple locations with different curvatures within the non-converging region on the retina," can be satisfied.

[0152] In this structure, the non-converging region on the retina remains spherical. Therefore, unlike the aspherical shape described in Patent Document 3, it can fully exert the defocus power that inhibits myopia progression.

[0153] Here, we will explain the meaning of the term "multiple parts".

[0154] In the case of this item and in embodiments 3 to 6 described later, even if there is a non-converging region on the retina within the circle, there are portions with different radial curvatures within that region. Therefore, "multiple portions" refers to different portions within at least one non-converging region on the retina.

[0155] In the case of ii) below and in the examples 1 to 2 described later, two non-converging regions on the retina need to exist within the circle. Therefore, "multiple locations" refers to distinct non-converging regions on the retina.

[0156] ii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a curvature of a certain value, and by having multiple annulus with different surface curvatures within the circle. This item corresponds to Embodiments 1 and 2 described later.

[0157] This item differs from i) in that the surface shape of each annulus, which is a non-converging region on the retina, is a single sphere. Therefore, in this item, to satisfy condition 2, at least two of the non-converging regions on the retina exist within the circle. Even in this item, the aforementioned assumption applies. That is, assuming that when the wearer observes near the eye, even if it appears as if an image is to be formed on the retina due to defocus power 1, the amount of light in the blurred image caused by defocus power 2 and base power is large, resulting in the wearer not seeing an image formed by the non-converging regions on the retina. Therefore, the effect of inhibiting myopia progression can be maintained.

[0158] iii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a curvature of multiple values ​​or a single value, and by having portions within the circle with different surface curvatures. This item is a combination of i) and ii) above.

[0159] The specific method of this mixing is not limited. For example, i) and ii) above can be configured alternately. Specifically, the following configuration can be adopted, starting from the side closest to the center of the lens: ii) the ring that serves as a non-converging region on the retina (the ring formed by symbol 3aα in specific examples 1 and 2 described later → the ring that serves as the basal region) → i) the ring that serves as a non-converging region on the retina (the ring formed by symbols 3a1 and 3a2 in specific examples 3 and 4 described later) → the ring that serves as the basal region → ii) the ring that serves as a non-converging region on the retina (the ring formed by symbol 3aα or the ring formed by symbol 3aβ in specific examples 1 and 2 described later) →…

[0160] In addition, the descriptions in i) and ii) above are used.

[0161] Hereinafter, preferred and modified examples of the surface shape of each annulus, which is a non-converging region on the retina, satisfying either i) or iii), will be described.

[0162] Preferably, the curvature difference of the surface shape within each annulus, which is a non-converging region on the retina, is equal to or smaller (i.e., the difference between the curvature of the sub-annulus with the largest curvature and the sub-annulus with the smallest curvature, hereinafter the same) in the radial direction away from the lens center (also referred to as the former provision of Preferred Example 1), and, among the annulus that are non-converging regions on the retina, the curvature difference of the surface shape within the annulus furthest from the lens center is smaller than the curvature difference of the surface shape within the annulus closest to the lens center (also referred to as the latter provision of Preferred Example 1). The latter provision is to exclude the case where the curvature difference of the surface shape within each annulus that is a non-converging region on the retina is always equal when viewed radially.

[0163] Preferably, within each annulus, which constitutes a non-converging region on the retina, the curvature of the surface shape closest to the lens center is greater than the curvature of the surface shape furthest from the lens center. Specific examples illustrate the relationship between the non-converging region (1) and the non-converging region (2) on the retina in Examples 3 and 4, and the relationship between the non-converging region (1) and the non-converging region (3) on the retina in Examples 5 and 6. This is to ensure that the image and object are in opposite positions when viewed through the annulus, and to reliably prevent convergence on the retina. Details of this are as follows.

[0164] According to Prentice's law, the prism power produced by a lens is directly proportional to the product of the distance from the lens center and the power. Therefore, the farther the line of sight through the eyeglass lens is from the eyepoint, the greater the dispersion of images produced by different optical powers. Thus, by adopting the structure described in the previous section, it is possible to suppress the amplification of image dispersion in non-converging areas of the retina with different curvatures.

[0165] To suppress the development of refractive errors, it is said that applying defocus stimulation to the retina (especially the peripheral retina) is effective. However, if an image is formed on the retina due to this defocus power, the defocus stimulation disappears, or if a prescription power is simultaneously stimulated with an opposite defocus power, the opposite effect may occur. Simultaneously placing multiple non-converging regions on the retina with different defocus powers within the pupil circle is intended to prevent an image from forming on the retina due to defocus power.

[0166] Compared to the case where only one defocus power is set for the non-converging area on the retina, if the total area of ​​the non-converging area on the retina is assumed to be equal in both cases when two defocus power is set for the non-converging area on the retina, the area of ​​the non-converging area on the retina for each defocus power can be reduced.

[0167] By reducing the area of ​​the non-converging region on the retina at a defocused optical power, the amount of light can be reduced, thereby diminishing the advantage of imaging on the retina.

[0168] Because the amount of prism in the non-converging region of the retina differs at different defocus powers, the two images are slightly offset, thereby increasing the blurriness and further reducing the likelihood of imaging.

[0169] However, if the image shift caused by prism aberration is too large, the two images will not be confused and may be visible independently. To prevent this, it is necessary to reduce the optical power difference (curvature difference) in the non-converging areas on the retina in the peripheral part of the lens, away from the center of the lens.

[0170] The structure reflecting the above insights is the aforementioned preferred example 1. Furthermore, the term "spherical shape" in this specification also includes spheres that can produce a single degree even with different prism amounts.

[0171] The number of different curvature values ​​can be 2 to 4. This structure reduces the difficulty of manufacturing.

[0172] Regarding the arrangement of sub-rings within each ring, which constitutes a non-converging region on the retina, it is desirable to have a larger diameter and lower optical power. This is to reduce prismatic aberration caused by sub-rings of different optical powers, making the image produced by the defocused optical power unclear, thereby maximizing the function of suppressing the development of refractive errors.

[0173] In condition 2, the curvature difference between the different rings can be 0.25D or more. In the cases described in i) and iii), the curvature difference within each ring can be 1.00D or more. In the cases described in ii) and iii), the curvature difference between each ring can be 0.25D or more.

[0174] Furthermore, the aforementioned provision can be interpreted as, when considering the preferred example 1 described above, that in each annulus, which is a non-converging region on the retina, the curvature difference between adjacent sub-annulus within the annulus is at least 0.25D. The curvature difference within an annulus (the difference between the curvature of the sub-annulus with the maximum curvature and the curvature of the sub-annulus with the minimum curvature) can be 0.50D or more.

[0175] With this structure, even if the wearer appears to be forming an image on the retina when observing from the near side due to the defocus power 1, the image appears more blurred to the wearer because of the image formed by the spherical surface of defocus power 2 located near the spherical surface of defocus power 1. As a result, in the ghosting caused by the annular base region and the annular non-converging beam region, the image formed by the base region is more likely to be formed on the wearer's retina.

[0176] When viewed from above, when a circle with a diameter of 4 mm is arranged within the functional area, when the configurable circles are grouped together, the area of ​​the group of circles satisfying conditions 1 to 3 (excluding duplicate parts in the group) (the so-called top-view area) can be 80% or more relative to the area of ​​the functional area, and preferably 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, and 100% in that order.

[0177] When viewed from above, the area of ​​the non-converging retinal region 3a within the functional region 3, relative to the area of ​​the non-converging retinal region 3a in the entire spectacle lens 1 (area ratio), is preferably 80% or more. This area ratio is preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% respectively.

[0178] The shape of the outer edge of functional region 3 (i.e., the shape of the side of functional region 3 in the outer clear region 4 and the boundary between the two) is preferably defined in the following manner.

[0179] The preferred functional region 3 is housed within a circle centered on the eye point and having a diameter of any value between 15.00 and 32.00 mm.

[0180] In this structure, if the area is above the lower limit, the area of ​​the non-converging region on the retina can be sufficiently ensured.

[0181] In this structure, if the value is below the upper limit, the following effect is achieved: the farther the line of sight passes from the center of the lens, the greater the difference in prism power between the basal region and the non-converging region on the retina, resulting in a greater effect of double vision for the wearer. Therefore, if the value is below the upper limit, the non-converging region on the retina is positioned not excessively far from the center of the lens, thus preventing the prism power difference from increasing excessively.

[0182] There are no limitations on the size and shape of the centrally clear area 2. Regarding the shape, the outline of the functional area closest to the center of the lens directly constitutes the shape of the centrally clear area. As a reference for the lower limit of the size of the centrally clear area 2, it can be a size that can contain a circle with a diameter of 6.00 mm centered on the eyepoint. As a reference for the upper limit of the size of the centrally clear area 2, it can be a size that can be contained within a circle with a diameter of 13.00 mm centered on the eyepoint.

[0183] If the structure described in the previous paragraph is used, sufficient visual recognition can be obtained when viewed from the front.

[0184] In this example, the annular functional region 3 is on a base region 3b with the same shape as the central clear region 2 or the outer clear region 4 shown in Patent Document 1, but unlike Patent Document 1, it is composed of multiple rings (i.e., non-converging regions 3a on the retina).

[0185] The radial widths of the non-converging regions and the basal regions on the retina are not limited as long as conditions 1 to 3 are met. As an example of these values, they can be in the range of 0.5 to 1.5 mm. These values ​​can be different from each other or all the same. For example, in the embodiment described later, all these values ​​are 1.0 mm. Furthermore, the number of each annulus is not limited as long as conditions 1 to 3 are met.

[0186] As a reference, in functional region 3, it can be defined as ensuring that more than 30% (or more than 40%, 50%, or 60%) of the light beam entering the wearer's pupil does not converge on the retina. The higher this percentage value, the greater the expected effect of inhibiting myopia progression or reducing hyperopia, but on the other hand, visual acuity decreases. This percentage value should be appropriately determined based on the balance between the effect of inhibiting myopia progression or reducing hyperopia and visual acuity. An upper limit could be, for example, 70%. Furthermore, when observing within the functional region and / or the circle described above, the basal region can be set larger than any other non-converging region.

[0187] Furthermore, in functional region 3, the area of ​​the supraretinal non-converging region 3a, which serves as a structure for inhibiting myopia progression or reducing hyperopia, when viewed from above, can be specified to be more than 40% and less than 70% of the functional region. The supraretinal non-converging region 3a can also be configured to become sparse towards the outer edge of functional region 3. In addition, there can be multiple supraretinal non-converging regions in the functional region, and there can be two or more defocus powers set in these multiple supraretinal non-converging regions. The area of ​​each type of defocus power can be approximately the same (for example, the area of ​​each region is within ±10% of the average area of ​​each type).

[0188] The shape of functional region 3 is not limited and can be ring-shaped when viewed from above. The inner side (i.e., the boundary between the central clear region 2 and functional region 3) and / or the outer side (i.e., the boundary between the outer clear region 4 and functional region 3) of the ring can be circular, rectangular, elliptical, or a combination thereof.

[0189] In one embodiment of the present invention, the spectacle lens 1 can be a spectacle lens 1 after being fitted into a frame, wherein a portion of the functional region 3 in the spectacle lens 1 can contact the outer edge of the spectacle lens 1, and other portions of the functional region 3 can contact the outer clear region 4. The statement "outer clear region located around the functional region" includes this situation. Furthermore, it does not preclude the provision of a non-converging region 3a on the retina further outward from the outer clear region 4.

[0190] However, considering that good visual recognition can also be easily obtained in the peripheral field of vision, it is preferable not to provide any structure (e.g., defocus area, convex area and / or concave area, embedded structure, etc.) 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 is the outer clear area 4.

[0191] Preferably, the non-converging region 3a on the retina is not provided in the clear region 4 on the outer side of the outer edge of the functional region 3 (preferably between the outer edge of the functional region 3 and the outer edge of the spectacle lens 1).

[0192] Regarding condition 3, when the circle is divided into regions with a certain degree, the effects of the invention can be reliably achieved as long as the base region has the largest area. On the other hand, the effects of the invention may still be achieved even if only a small portion of all the circles does not satisfy condition 3.

[0193] The effects of the present invention can be reliably achieved as long as all of conditions 1 to 3 are satisfied. On the other hand, the effects of the present invention may still be achieved even if only a small portion of all the circles does not satisfy at least one of conditions 1 to 3.

[0194] For example, the “small portion” is described below.

[0195] When viewed from above, when a circle with a diameter of 4 mm is arranged within the functional area, when the configurable circles are grouped together, the area of ​​the group of circles that do not satisfy condition 3 (or at least one of condition 1, condition 2, and condition 3) (excluding duplicate parts in the group) (the so-called top-view area) can be less than 20% of the area of ​​the functional area, and preferably less than 15%, less than 10%, less than 5%, less than 1%, and 0% in sequence.

[0196] In the aforementioned spectacle lenses, by reversing the sign of the defocus power of the non-converging region on the retina, the light beam is focused not on the near side (+Z direction) but on its opposite side (-Z direction), thereby reducing farsightedness.

[0197] The description of the spectacle lens as one aspect of the present invention can also be applied to the design or manufacturing methods of spectacle lenses. One example is described below. Other contents described in this specification can be combined with the following structures.

[0198] "A method for designing or manufacturing an eyeglass lens, wherein the eyeglass lens has the effect of inhibiting the progression of myopia or reducing the effect of hyperopia, and has the following characteristics: "

[0199] The central clear area, which includes the eyepoint, allows light rays entering from the object's side to exit from the eye's side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0200] The functional region, a ring-shaped area surrounding the centrally clear region, has a basal region and a supraretinal non-converging region. The basal region allows light beams incident from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. The supraretinal non-converging region allows light beams incident from the object-side surface to exit from the eye-side surface, but prevents the light beams entering the wearer's pupil from converging on the retina.

[0201] The outer clear region, which is the area surrounding the functional region, allows light rays entering from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0202] When viewed from above, both the basal region and the non-converging region on the retina appear as rings.

[0203] The rings that constitute the non-converging regions on the retina are spherical in shape.

[0204] When viewed from above, if a circle with a diameter of 4 mm is arranged within the functional area, conditions 1 to 3 above are satisfied in any arrangable circle.

[0205]

[0206] There are no particular limitations on the configuration of defocused regions, which are non-converging areas on the retina. For example, it can be determined based on the visual recognizability of the defocused region from the outside, the design features it provides, and the refractive power adjustment it brings. In addition, a defocused region is an example of a non-converging region on the retina, which causes the light beam to not converge on the retina, but to converge on the near-anterior side (+Z direction side) of the retina.

[0207] Although the specific value of the defocus power in each defocus region is not limited, for example, the minimum defocus power brought about by the defocus region on spectacle lens 1 is preferably in the range of 0.50 to 4.50D, and the maximum value is preferably in the range of 3.00 to 10.00D. The difference between the maximum and minimum values ​​is preferably in the range of 1.00 to 5.00D.

[0208] Lens substrates can be formed from thermosetting resins such as thiocarbamate, allyl, acrylic, and cyclic sulfur. Alternatively, other resins that achieve the desired refractive index can be selected as the resin material constituting the lens substrate. Furthermore, inorganic glass can be used as a lens substrate instead of resin materials.

[0209] The hard coating is formed, for example, using a thermoplastic resin or a UV-curable resin. The hard coating can be formed by immersing the lens substrate in a hard coating solution or by spin coating. Such a hard coating improves the durability of the spectacle lens 1.

[0210] Anti-reflective films are formed, for example, by vacuum evaporation of anti-reflective agents such as ZrO2, MgF2, and Al2O3. Such anti-reflective film coverage improves the visual clarity of the image transmitted through the eyeglass lens 1.

[0211] Multiple defocus regions, forming a ring, are formed on the object-side surface of the lens substrate. Therefore, when the object-side surface is covered with a hard coating and an anti-reflective film, multiple defocus regions are also formed in the hard coating and the anti-reflective film along the defocus regions in the lens substrate.

[0212] In manufacturing spectacle lens 1, firstly, a lens substrate is formed by a known molding method such as casting polymerization. For example, a molding die having a molding surface with a transfer shape having multiple rings is used to form the lens substrate by casting polymerization, thereby obtaining a lens substrate having a defocus area on at least one surface.

[0213] Then, after obtaining the lens substrate, a hard coating is formed on the surface of the lens substrate. The hard coating can be formed by immersing the lens substrate in a hard coating liquid or by using methods such as spin coating.

[0214] After forming the hard coating, an anti-reflective film is further formed on the surface of the hard coating. The anti-reflective film can be formed by vacuum evaporation of the raw materials used for the film.

[0215] This manufacturing method allows for the production of spectacle lenses 1 with multiple defocused areas protruding towards the object side on the object-side surface.

[0216] The thickness of the membrane formed by the above processes can be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, more preferably 1.0 to 3.0 μm). However, the membrane thickness is determined according to the required function of the membrane and is not limited to the range shown.

[0217] Multiple layers of film can be formed on the membrane. Examples of such films include antireflective films, hydrophobic or hydrophilic antifouling films, and antifog films. Known techniques can be applied to the formation of these films.

[0218] Eyeglasses

[0219] The eyeglasses, which are made by cutting the periphery of the aforementioned spectacle lens 1 according to a prescribed frame shape and embedding it into the frame, also reflect the technical concept of the present invention. The type and shape of the frame are not limited; they can be full-rim, half-rim, bottom-rim, or rimless.

[0220] Hereinafter, specific examples 1 to 6 of spectacle lens 1 according to one aspect of the present invention are shown. The present invention is not limited to the following specific examples.

[0221] <Reference Example 1>

[0222] Figure 7A This is a schematic top view of the eyeglass lens 1 involved in Example 1.

[0223] The following spectacle lens 10 was manufactured. Furthermore, the spectacle lens 10 consists only of a lens substrate, without any other materials being laminated onto the lens substrate. As the prescription refractive power, S (spherical refractive power) was set to 0.00D, and C (astigmatic refractive power) was set to 0.00D.

[0224] • Diameter of the lens substrate when viewed from above: 60.0mm

[0225] • Types of lens substrate: PC (polycarbonate)

[0226] • Refractive index of the lens substrate: 1.589

[0227] • Shape of the central clear area 2: A top-view circle (9.0mm in diameter) centered on the lens center (geometric center and eyepoint).

[0228] • Shape of functional area 3: The area centered on the lens center (geometric center and eyepoint) (diameter 27.0mm, but a ring-shaped area excluding the clear central area 2)

[0229] • The arrangement of the non-converging region (refer to Example 1) 30 on the retina and the basal region 3b: alternating radially.

[0230] • The forming surface of the non-converging region on the retina (refer to Example 1) 30: the surface on the side of the object.

[0231] • The shape of the non-converging region on the retina (refer to Example 1) 30: spherical and ring-shaped when viewed from above (the inner and outer sides of the ring are perfectly circular).

[0232] • Width of the non-converging region on the retina (refer to Example 1) 30: 1.0 mm

[0233] • Top view shape of base region 3b: ring-shaped (the inner and outer sides of the ring are perfectly circular).

[0234] • Width of base region 3b: 1.0 mm

[0235] • Wearer's pupil diameter: assumed to be 4.0mm

[0236] The above content is common to all specific examples, so it will be omitted below.

[0237] In Reference Example 1, all the rings that are non-converging regions on the retina (Reference Example 1) 30 have a curvature (equivalent to a defocus power of 3.50D).

[0238] Figure 7B This is a graph showing the radial sagittal values ​​in spectacle lens 1 as described in Reference Example 1 (vertical axis: sagittal value, horizontal axis: distance from the center of the lens). The dotted lines represent the curves of the spherical surface forming the optical power of the central clear region 2, the basal region 3b, and the lateral clear region 4. The dashed lines represent the curves of the spherical surface forming the optical power of the non-converging regions on the retina. The solid lines represent the curves in spectacle lens 1.

[0239] "Sagittal value (h)" refers to the distance from the surface of the lens to the tangential plane at the center of the lens.

[0240] In expressing such Figure 7B In the diagram showing the sagittal values, the dotted lines (curves in the central clear area 2, the base area 3b, and the outer clear area 4) are formed by overlaying a curve assuming the entire surface of the spectacle lens 1 comprises these areas onto the solid line (curve in the spectacle lens 1). Specifically, near the center of the lens, based on a curve of this dotted line, when viewed radially, at the location where a defocused area (a spherical ring) exists, the dotted line curve is moved downwards and connected to the solid line in order to overlay it. Then, at the location where the base area 3b exists, the dotted line curve is moved upwards and connected to the solid line in order to overlay it. This forms the solid line (curve in the spectacle lens 1).

[0241] Figure 7C This is a graph showing the power D (right vertical axis, solid line, indicated by the white arrow) and prism power Δ (left vertical axis, dashed line, indicated by the black arrow) of the object-side surface in the spectacle lens 1 involved in Reference Example 1 (horizontal axis: distance from the center of the lens). In other graphs with power D and prism power Δ as the vertical axes, the white and black arrows are omitted.

[0242] Since the object-side surface of the spectacle lens 1 does not form a physical step in the functional area 3, therefore... Figure 1C The curve for the prism power also exhibits a stepped shape. The same applies to the trends of the prism power curves in the following specific examples.

[0243] In the spectacle lens 10 described in Reference Example 1, although the effects of the present invention are not achieved, unlike the aspherical shape described in Patent Document 3, the defocus power that brings about the effect of inhibiting myopia development can be fully utilized. The spectacle lens 10 described in Reference Example 1 has the central clear region 2, the functional region 3, and the outer clear region 4. When viewed from above, both the base region 3b and the non-converging region 30 on the retina are annular. The surface shape of each annular region of the non-converging region 30 on the retina is part of a sphere centered on a point on the optical axis. When viewed from above, when a circle with a diameter of 4 mm is arranged in the functional region 3, the spectacle lens 10 satisfies conditions 1 and 3 in any configurable circle.

[0244] <Concrete example 1>

[0245] In the following specific examples 1 and 2, the method described in ii) above was adopted. That is, a method was adopted in which a ring of curvature in the non-converging region of the retina is given, but the ring of curvature has multiple values.

[0246] Specific examples 1 and 2 use the following structure.

[0247] • Defocus power of the non-converging region (curvature α) 3aα on the retina: 4.50D

[0248] • Defocus power of the non-converging region (curvature β) 3aβ on the retina: 2.50D

[0249] • The arrangement order of non-converging regions on the retina: starting from the side closest to the center of the lens, the order is as follows: ring of non-converging region 3aα on the retina → ring of basal region 3b → ring of non-converging region 3aβ on the retina → ring of basal region 3b → ring of non-converging region 3aα on the retina → ring of basal region 3b → ring of non-converging region 3aβ on the retina → ring of basal region 3b → ring of non-converging region 3aα on the retina → ring of basal region 3b → ring of non-converging region 3aβ on the retina.

[0250] Figure 1A These are schematic top views of specific examples 1 and 2 of the spectacle lens 1 involved in one aspect of the present invention.

[0251] Figure 1B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 1 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region 3aα of the retina. Double-dotted lines represent curves in the non-converging region 3aβ of the retina. Solid lines represent curves in the spectacle lens 1.

[0252] Figure 1C This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the spectacle lens 1 in a specific example 1 of an embodiment of the present invention.

[0253] <Concrete example 2>

[0254] Figure 2A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 2 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region 3aα of the retina. Double-dotted lines represent curves in the non-converging region 3aβ of the retina. Solid lines represent curves in the spectacle lens 1.

[0255] Figure 2B This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the spectacle lens 1 in a specific example 2 of an embodiment of the present invention.

[0256] <Concrete example 3>

[0257] In the following specific examples 3 to 6, the preferred embodiment of i) is adopted. That is, in each annulus of the non-converging region on the retina, when viewed radially, the spherical surfaces of each curvature are connected on the side closer to the center of the lens and the side farther away.

[0258] Specifically, examples 3 and 4 use the following structure.

[0259] • Defocus power of the non-converging region (1) 3a1 on the retina: 4.50D

[0260] • Defocus power of the non-converging region (2) 3a2 on the retina: 2.50D

[0261] • Spherical connection method: When viewed radially, a non-converging region (1) 3a1 on the retina is placed on the side closer to the center of the lens, and a non-converging region (2) 3a2 on the side farther away is placed on the other side.

[0262] • Connection position: The center of the non-converging area on the retina when viewed radially (0.5 mm from the side of the non-converging area on the retina closer to the center of the lens towards the side furthest away).

[0263] Figure 3A These are schematic top views of specific examples 3 and 4 of the spectacle lens 1 involved in one aspect of the present invention.

[0264] Figure 3B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 3 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region (1) 3a1 on the retina. Double-dotted lines represent curves in the non-converging region (2) 3a2 on the retina. Solid lines represent curves in the spectacle lens 1.

[0265] Figure 3C This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the spectacle lens 1 in a specific example 3 of an embodiment of the present invention.

[0266] <Concrete example 4>

[0267] Figure 4A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 4 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region (1) 3a1 on the retina. Double-dotted lines represent curves in the non-converging region (2) 3a2 on the retina. Solid lines represent curves in the spectacle lens 1.

[0268] Figure 4B This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the eyeglass lens 1 in a specific example 4 of an embodiment of the present invention.

[0269] <Concrete example 5>

[0270] Specifically, examples 5 and 6 use the following structure.

[0271] • Defocus power of the non-converging region (1) 3a1 on the retina: 4.50D

[0272] • Defocus power of the non-converging region (2) 3a2 on the retina: 3.50D

[0273] • Defocus power of the non-converging region (3) 3a3 on the retina: 2.50D

[0274] • Spherical connection method: When viewed radially, a non-converging region (1) 3a1 on the retina is placed near the center of the lens, a non-converging region (2) 3a2 on the retina is placed in the center, and a non-converging region (3) 3a3 on the side furthest away from the lens is placed.

[0275] • The connection point between the non-converging regions (1) 3a1 and (2) 3a2 on the retina: when viewed radially, the position is 0.33 mm forward from the side of the non-converging region on the retina closer to the lens center towards the side farther from the lens center.

[0276] • The connection point between the non-converging regions (2) 3a2 and (3) 3a3 on the retina: When viewed radially, the point is 0.33 mm forward from the side of the non-converging region on the retina furthest from the lens center toward the lens center.

[0277] In other words, at the radial center of each annulus that is a non-converging region on the retina, the non-converging region on the retina with the largest defocus power (2) 3a2 is configured.

[0278] Figure 5A These are schematic top views of specific examples 5 and 6 of the spectacle lens 1 involved in one aspect of the present invention.

[0279] Figure 5B This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 5 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region (1) 3a1 on the retina. Double-dotted lines represent curves in the non-converging region (2) 3a2 on the retina. Long dashed lines represent curves in the non-converging region (3) 3a3 on the retina. Solid lines represent curves in the spectacle lens 1.

[0280] Figure 5C This is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the spectacle lens 1 in a specific example 5 of an embodiment of the present invention.

[0281] <Concrete example 6>

[0282] Figure 6A This is a graph showing the sagittal values ​​(vertical axis: sagittal value, horizontal axis: distance from the center of the lens) in a specific example 6 of the spectacle lens 1 according to one aspect of the present invention. Dotted lines represent curves in the central clear region 2, the basal region 3b, and the lateral clear region 4. Dashed lines represent curves in the non-converging region (1) 3a1 on the retina. Double-dotted lines represent curves in the non-converging region (2) 3a2 on the retina. Long dashed lines represent curves in the non-converging region (3) 3a3 on the retina. Solid lines represent curves in the spectacle lens 1.

[0283] Figure 6BThis is a graph (horizontal axis: distance from the center of the lens) showing the power D (right vertical axis, solid line) and prism power Δ (left vertical axis, dashed line) of the object side surface of the spectacle lens 1 in a specific example 6 of an embodiment of the present invention.

[0284] The scope of this invention is not limited to the embodiments described above, but also includes various modifications or improvements made within the scope of deriving specific effects obtained through the constituent elements of the invention or combinations thereof. For example, this invention can be applied not only to spectacle lenses, but also to other ophthalmic lenses (e.g., contact lenses, intraocular lenses (for phakic or aphakic eyes)).

[0285] Symbol Explanation

[0286] 1: Eyeglass lenses

[0287] 2: Clear area on the center side

[0288] 3: Functional areas

[0289] 3aα: Non-converging region on the retina (curvature α)

[0290] 3aβ: Non-converging region on the retina (curvature β)

[0291] 3a1: Non-converging region on the retina (1 of 1)

[0292] 3a2: Non-converging areas on the retina (part 2)

[0293] 3a3: Non-converging region on the retina (the third one)

[0294] 3b: Basal region

[0295] 4: Clear outer area

[0296] 10: Eyeglass lenses (see Example 1)

[0297] 30: Non-converging areas on the retina (see Example 1)

Claims

1. A spectacle lens that inhibits the progression of myopia or reduces hyperopia, comprising: The central clear area, which includes the eyepoint, allows light rays entering from the object's side to exit from the eye's side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. The functional region, a ring-shaped area surrounding the centrally clear region, has a basal region and a supraretinal non-converging region. The basal region allows light rays incident from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. The supraretinal non-converging region allows light rays incident from the object-side surface to exit from the eye-side surface, but prevents the light rays entering the wearer's pupil from converging on the retina. The outer clear region, which is the area surrounding the functional region, allows light rays entering from the object-side surface to exit from the eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power. When viewed from above, both the basal region and the non-converging region on the retina appear as rings. The rings that constitute the non-converging regions on the retina are spherical in shape. When viewed from above, if a circle with a diameter of 4 mm is arranged within the functional area, the following condition is satisfied in any configurable circle: <Condition 1> The circle contains the basal region and the non-converging region on the retina. <Condition 2> Within the non-converging region of the retina existing within the circle, there are multiple locations with different curvatures. <Condition 3> When the circle is divided into regions with a certain degree, the base region has the largest area.

2. The spectacle lens according to claim 1, wherein it satisfies any one of the following i) to iii), and, The shape of each annulus, which is a non-converging region on the retina, satisfying i) or iii), is formed by radially arranged spherical surfaces with different curvatures. i) The surface shape of each annulus, which is a non-converging region on the retina, has a curvature with multiple values, and there are annulus bands with different curvatures within the circle, thereby satisfying condition 2. ii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a certain curvature and having multiple annulus with different curvatures within the circle. iii) The surface shape of each annulus, which is a non-converging region on the retina, satisfies condition 2 by having a curvature of multiple values ​​or a curvature of one value, and by having portions of different curvatures within the circle.

3. The spectacle lens according to claim 2, which satisfies either i) or iii), and, In the radial direction away from the center of the lens, the curvature difference of the surface shape within each annulus, which is a non-converging region on the retina, is equal or decreases, and... In each ring that is a non-converging region on the retina, the curvature difference of the surface shape in the ring furthest from the center of the lens is smaller than the curvature difference of the surface shape in the ring closest to the center of the lens.

4. The spectacle lens according to claim 2, which satisfies either i) or iii), and, Within each ring that constitutes a non-converging region on the retina, the curvature of the surface shape furthest from the center of the lens is greater than the curvature of the surface shape closest to the center of the lens.

5. The spectacle lens according to claim 2, wherein the number of different curvature values ​​is 2 to 4.

6. The spectacle lens according to claim 5, wherein within each annulus, which is a non-converging region on the retina, a spherical surface is disposed with a larger curvature closer to the center among the different curvatures.

7. The spectacle lens according to claim 1, wherein in condition 2, the difference in curvature between the different lenses is 0.25D or more.

8. The spectacle lens according to claim 1, wherein, when viewed from above, the functional area is contained within a circle centered at the eye point and having a diameter of any value between 15.00 and 32.00 mm.

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

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