Eyeglass lens

Abstract

The present application provides a spectacle lens having a central clear area realizing a wearer's prescribed refractive power and including an eye point, and a ring-shaped functional area surrounding the central clear area, the functional area having a base area realizing the prescribed refractive power, and a plurality of defocus areas having different refractive powers from the prescribed refractive power, the plurality of defocus areas being arranged along an X direction and a Y direction intersecting the X direction at a prescribed angle in a plan view, a maximum value of an external angle of a convex polygon having an inside in which no center of the defocus area exists and a maximum area when assuming that the convex polygon has a boundary with two or more centers of the defocus areas existing in a boundary portion between the central clear area and the functional area as a virtual line being a side of the convex polygon in the plan view being 36 degrees or less.

Description

Technical Field

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

[0002] As one way to achieve the effect of inhibiting the progression of myopia or reducing the effect of hyperopia, for example, a spectacle lens having a clear area and a functional area is described in Patent Document 1.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent No. 7177959. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] One embodiment of the present invention aims to provide a technique that can reduce the ghosting effect caused by the blurring of the boundary between the central clear area and the functional area.

[0008] Methods for solving problems

[0009] The first aspect of the present invention is an eyeglass lens having:

[0010] A clear central area that provides the wearer with their prescribed refractive power, including the ocular point; and

[0011] A ring-shaped functional area surrounds the central clearly defined area.

[0012] The functional region includes: a basal region that achieves the prescribed refractive power; and multiple defocus regions that have refractive powers different from the prescribed refractive power.

[0013] When viewed from above, the plurality of defocused areas are arranged along the X direction and the Y direction, which intersects the X direction at a predetermined angle.

[0014] When viewed from above, assuming that the center of the defocused region does not exist inside the convex polygon with the following virtual line as its side and the area of ​​the convex polygon is at its maximum, the maximum value of the exterior angle of the convex polygon is less than 36 degrees, and the virtual line passes through the boundary portion of the central sharp region and the functional region, there are two or more centers of the defocused region.

[0015] The second aspect of the present invention is the spectacle lens described in the first aspect above, wherein the diameter of the defocus region is 0.5 mm or more and 2.5 mm or less.

[0016] The third aspect of the invention is the spectacle lens described in the first aspect above, wherein the distance r from the center of the convex polygon to the center of the nearest defocused region is more than four times the distance p between the centers of adjacent defocused regions.

[0017] The fourth aspect of the invention is the spectacle lens described in the first aspect above, wherein the distance r from the center of the convex polygon to the center of the nearest defocused region is less than 5 times the distance p between the centers of adjacent defocused regions.

[0018] The fifth aspect of the present invention is the spectacle lens described in the first aspect above, wherein the distance r from the center of the convex polygon to the center of the nearest defocused region is 5.5 mm or more and 10 mm or less.

[0019] The sixth aspect of the present invention is an eyeglass lens as described in any one of the first to fifth aspects above, which has the effect of inhibiting the progression of myopia or reducing the effect of hyperopia.

[0020] Invention Effects

[0021] According to one embodiment of the present invention, the ghosting effect caused by the blurring of the boundary between the clear central area and the functional area can be reduced. Attached Figure Description

[0022] Figure 1A This is a magnified top view of the eye point of the spectacle lens used in the reference example to inhibit the progression of myopia, and the defocus area is arranged in a concentric circle pattern.

[0023] Figure 1B This is a magnified top view of the area near the eyepoint of the spectacle lens used in the reference example to inhibit the progression of myopia, and the defocus area is arranged in a rectangular coordinate system.

[0024] Figure 2 This is a diagram simulating how the original image would appear blurred when the angle between the adjacent boundary lines at the boundary between the central sharp area and the functional area is changed in an eyeglass lens with a defocus area spacing of 1.5 mm, a diameter of 1 mm, and a height of 1 μm.

[0025] Figure 3 This is a magnified top view of the area near the eyepoint of the spectacle lens used in the reference example to inhibit the progression of myopia.

[0026] Figure 4 This is a top view of the object side surface of the eyeglass lens according to an embodiment of the present invention.

[0027] Figure 5This is a magnified top view of the area near the eye point of the eyeglass lens according to an embodiment of the present invention.

[0028] Figure 6 This is a magnified top view of the area near the eye point of the spectacle lenses of samples 1 to 5 involved in the embodiments of the present invention.

[0029] Figure 7 This indicates that in the spectacle lenses of samples 1 to 5 involved in the embodiments of the present invention, from Figure 6 The figure shows the simulation results of how the original image would appear blurred when the line of sight is rotated 2mm along the edge of the convex polygon in the defocused area indicated by the arrow. Detailed Implementation

[0030] <Insights gained by the inventor>

[0031] First, the inventor's insights will be explained. Figure 1A as well as Figure 1B This is a magnified top-view diagram of the area near the eyepoint of the spectacle lens used in the reference example to inhibit the progression of myopia. Figure 1A as well as Figure 1B As shown, spectacle lenses that inhibit myopia progression, for example, have: a central clear region 110 including the eyepoint that achieves the wearer's prescribed refractive power; and an annular functional region 120 surrounding the central clear region 110, the functional region 120 having a base region 130 that achieves the prescribed refractive power; and multiple defocus regions 140 (also called convex regions) having a refractive power different from the prescribed refractive power. Through these structures, the spectacle lenses inhibit myopia progression. Furthermore, details of each region will be described later.

[0032] In general eyeglass lenses designed to inhibit myopia progression, the configuration of multiple defocus zones (140°) falls into two main categories. That is, there are... Figure 1A As shown, the out-of-focus area 140 is arranged in a concentric circle pattern, or as... Figure 1B The rectangular / oblique coordinate system type shown is arranged at equal intervals along the X direction and the Y direction which intersects the X direction at a specified angle (for simplicity, it is also called the rectangular coordinate system type).

[0033] In concentric circle type spectacle lenses, the configuration cycle and configuration method of the defocus region 140 vary depending on the position of the functional region 120, resulting in a disadvantage of lower uniformity of optical characteristics in the functional region 120. For example, in Figure 1AAs can be seen from regions Z1 and Z2, the defocus regions 140 are configured differently. On the other hand, in a Cartesian coordinate system type of spectacle lens, since the defocus regions 140 are arranged along the same direction and at equal intervals, almost the entire functional region 120 can obtain the same optical characteristics.

[0034] However, through the inventors' research, it was discovered that in Cartesian coordinate system type eyeglass lenses, the following problem exists: at the boundary between the central clear area 110 and the functional area 120, discomfort is easily caused by a trailing blur orthogonal to the boundary line. For example, in Figure 1B In region Z3, the image blurs downwards onto the paper, and in region Z4, it blurs downwards and to the right. Therefore, under conditions such as binocular vision, these blurs overlap, creating a sense of multiple blurs, which is perceived as a double image. This will be referred to as the sensation of double imagery below.

[0035] The inventors conducted in-depth research on the aforementioned issues. The reason for the perceived multiple blurs and ghosting effect can be attributed to a significant change in the direction of the trailing blur, orthogonal to the boundary line, at the boundary between the central clear region 110 and the functional region 120. For example, in... Figure 1B In the illustrated eyeglass lens, the blur direction changes by approximately 60 degrees due to the hexagonal boundary. Therefore, the inventors believed that by altering the design of the boundary, the blur direction could change by only a smaller angle, potentially reducing the perception of ghosting. Figure 2 This refers to the effect on the original image when the angle between adjacent boundary lines at the boundary portion is changed within a 140° defocused area of ​​an eyeglass lens with a spacing of 1.5 mm, a diameter of 1 mm, and a height of 1 μm. Figure 2 The simulation results show how blurry the top left corner of the paper would appear. Furthermore, by... Figure 2 An experiment in which the images were presented to multiple subjects and the visual perception was compared yielded the following results: if the angle of change of the direction of the adjacent boundary line at the boundary part (i.e. the change of the blur direction) is less than 36 degrees, most subjects are less likely to perceive ghosting.

[0036] Figure 3 This is a magnified top-view diagram of the area near the eyepoint of the spectacle lens used in the reference example to inhibit the progression of myopia. Figure 3 As shown, the direction of blurring is the convex polygon 200 formed by the virtual line connecting the center of the defocused region 140, which exists at the boundary between the central sharp region 110 and the functional region 120. Figure 2 The perpendicular direction of the side of the hexagon (in the middle) Figure 2(The arrow direction is shown). In this specification, assuming a convex polygon 200, virtual lines passing through the centers of two or more defocused regions 140 are used as the sides of the convex polygon 200, and the center of the defocused region 140 is not present inside the convex polygon 200, and the area of ​​the convex polygon 200 is maximized. The inventors have discovered that by increasing the vertices of the convex polygon 200 and designing it so that the maximum value of the exterior angle of the convex polygon 200 is less than 36 degrees, even when the configuration of the defocused region 140 is a Cartesian coordinate system type, it is possible to achieve eyeglass lenses that do not easily cause a ghosting sensation at the boundary between the central sharp region 110 and the functional region 120.

[0037] Furthermore, to reduce the exterior angles of the convex polygon 200, i.e., to depict a convex polygon 200 that is nearly circular (with many vertices), it is necessary to reduce the diameter of the defocus region 140 and the spacing between adjacent defocus regions 140, or to increase the central sharp region 110, so that the boundary is composed of more defocus regions 140. However, if the diameter of the defocus region 140 is too small, or the central sharp region 110 is too large, the effect of inhibiting myopia progression may not be fully realized. Therefore, it can be said that it is preferable to... Figure 3 The existing design shown (with hexagonal borders) slightly enlarges the central sharp area 110 and makes the maximum value of the exterior angle of the convex polygon 200 less than 36 degrees. If the central sharp area 110 is slightly enlarged (for example, by about 20% compared to the existing design), the apparent central sharp area 110 can be adjusted by moving the eyeglass lenses slightly away from the eyes when fitting the glasses.

[0038] [Detailed Description of Embodiments of the Invention]

[0039] Next, an embodiment of the present invention will be described with reference to the following accompanying drawings. It should be noted that the present invention is not limited to these examples, but is illustrated by the claims and is intended to include all modifications with the same meaning and scope as the claims.

[0040] The spectacle lenses described in this specification have an object-side surface and an eye-side surface. "Object-side surface" refers to the surface of the spectacle lenses that is located on the object side when worn by the wearer, and "eye-side surface" refers to the opposite side, i.e., the surface of the spectacle lenses that is located on the eye-side when worn by the wearer. This relationship also applies to the lens substrate, which forms the basis of the spectacle lenses. That is, the lens substrate also has an object-side surface and an eye-side surface.

[0041] In this specification, the eyepoint is, for example, the position through which the wearer's line of sight passes when wearing glasses and facing directly forward; this will be used as an example below. The eyepoint can also be the position through which the wearer's line of sight passes when viewing an object close to them (i.e., when looking at something near), i.e., the near-vision eyepoint. In one embodiment of the invention, an example is shown where the geometric center of the spectacle lens before frame processing coincides with the eyepoint, the prism reference point, and the center of the lens. Furthermore, the position of the eyepoint can be determined by referring to a remark chart or centering chart published by the lens manufacturer.

[0042] <First Embodiment of the Invention>

[0043] (1) Eyeglasses and eyeglass lenses

[0044] Figure 4 This is a top view of the object-side surface of the spectacle lens 10 according to this embodiment. Figure 4 As shown, the spectacle lens 10 of this embodiment is a myopia progression suppression lens that has the effect of suppressing myopia progression, and it has a central clear area 11, a functional area 12, and a peripheral clear area 15.

[0045] The central clear region 11 is the area that achieves the wearer's prescribed refractive power and includes the eye point of the spectacle lens 10. In this embodiment, an example is shown where the center of the central clear region 11 coincides with the eye point of the spectacle lens 10. The central clear region 11 is, for example, a transparent portion with a smooth surface shape, and is the area where a light beam incident from the object's side surface exits from the eye's side surface, enters the wearer's pupil, and converges on the retina.

[0046] Through the central clear area 11, a prescription can be made (spherical power, astigmatism power, astigmatic axis, etc.). The spherical power can be the power to be corrected when looking straight ahead (object distance is infinity to about 1m) (distance power), or it can be the power to be corrected when looking at medium distances (object distance is about 1m to about 40cm) or when looking at close objects (object distance is about 40cm to about 10cm).

[0047] Furthermore, no structures (such as convex or concave regions) are provided in the central clear region 11 that are intended to inhibit the progression of myopia or reduce hyperopia (hereinafter also referred to as the effect of inhibiting the progression of myopia, etc.).

[0048] The central clear region 11 (and the base region 13 and peripheral clear region 15 within the functional region 12 described later) of this embodiment functions as a so-called monofocal lens. Its surface shape is not particularly limited, but in this embodiment, a spherical shape for the central clear region 11 is illustrated.

[0049] The functional region 12 is a portion having a refractive power different from the wearer's prescription refractive power, and is a ring-shaped region surrounding the central clear region 11. In this embodiment, within the functional region 12, as a portion having a refractive power different from the wearer's prescription refractive power, multiple defocus regions 14 (also called convex regions) are arranged in an island-like configuration (i.e., separated from each other without being adjacent to each other). When viewed from above, the multiple defocus regions 14 are arranged side-by-side at equal intervals along the X direction and the Y direction, which intersects the X direction at a predetermined angle. That is, the arrangement of the defocus regions 14 in this embodiment is of the Cartesian coordinate system type described above. More specifically, the centers of each defocus region 14 are independently and discretely arranged such that they form the vertices of an equilateral triangle, with the X and Y directions intersecting at 60 degrees. Within the functional region 12, the portion outside the defocus regions 14 is the base region 13, which performs the same function as the central clear region 11. Functional region 12, for example, is a region where a light beam incident from the object-side surface exits from the eye-side surface, but at least a portion of the light beam entering the wearer's pupil does not converge on the retina. Thus, the spectacle lens 10 of this embodiment exerts the effect of inhibiting myopia progression. Furthermore, in this specification, "top view" refers to the view taken from the normal to the eye point on the outer surface (object-side surface or eye-side surface) of the spectacle lens 10 unless otherwise specified.

[0050] Multiple defocus regions 14 may be formed on at least one of the object-side surface or the eyeball-side surface of the spectacle lens 10. In this embodiment, an example is shown where multiple defocus regions 14 are provided only on the object-side surface of the spectacle lens 10. The surface shape of the defocus region 14 is preferably, for example, spherical. The number of multiple defocus regions 14 within the functional region 12 is not particularly limited, for example, it is 20 or more and 500 or less.

[0051] Figure 5 This is a magnified top view of the area near the eyepoint of the spectacle lens 10 in this embodiment. Here, as... Figure 5 As shown, when viewed from above, assume a convex polygon 20 is formed by a virtual line connecting the center of the defocused region 14, which exists at the boundary between the central sharp region 11 and the functional region 12. In this case, virtual lines passing through the centers of two or more defocused regions 14 are considered as edges of the convex polygon 20. Furthermore, the interior of the convex polygon 20 is designed to have no center of the defocused region 14, and the area of ​​the convex polygon 20 is maximized. Additionally, considering manufacturing errors in the defocused region 14, the thickness of the virtual line is set to, for example, 0.1 mm. Even when the center of the defocused region 14 exists on the edge of the convex polygon 20, it can be considered that it does not fall under the case of "the center of the defocused region 14 exists inside the convex polygon 20".

[0052] The spectacle lens 10 of this embodiment is characterized in that the maximum value of the exterior angle of the convex polygon 20 is 36 degrees or less. Therefore, even if the defocus region 14 is arranged in a Cartesian coordinate system, the ghosting effect at the boundary between the central clear region 11 and the functional region 12 can be reduced. Furthermore, the maximum value of the exterior angle of the convex polygon 20 is preferably 30 degrees or less. This further reduces the ghosting effect at the boundary. Additionally, from the viewpoint of easily obtaining an effect of suppressing myopia progression without excessively expanding the central clear region 11 or excessively reducing the diameter of the defocus region 14, the maximum value of the exterior angle of the convex polygon 20 is preferably 27 degrees or more.

[0053] From the viewpoint of further reducing the ghosting effect at the boundary between the central sharp region 11 and the functional region 12, the convex polygon 20 is preferably rotationally symmetric, more preferably close to a regular polygon, and its aspect ratio (horizontal:vertical) is preferably close to 1:1. This is because the further it deviates from a regular polygon, the larger the exterior angles will be. Specifically, for example, the maximum value of the exterior angle of the convex polygon 20 is preferably less than 1.2 times the average value of the exterior angles (360 / n degrees when the convex polygon 20 is an n-sided polygon). In addition, for example, the aspect ratio of the convex polygon 20 is preferably in the range of 1:2 to 2:1.

[0054] The diameter of the defocus region 14 when viewed from above is preferably 0.5 mm or more and 2.5 mm or less, more preferably 0.8 mm or more and 1.4 mm or less. If the diameter of the defocus region 14 is less than 0.5 mm, it may be difficult to obtain the effect of inhibiting myopia progression. On the other hand, if the diameter of the defocus region 14 exceeds 2.5 mm, objects may be observed through the defocus region 14, resulting in the inability to correctly obtain the effect of inhibiting myopia progression. In addition, in this embodiment, the case where the diameter of the defocus region 14 within the functional region 12 is uniform has been described, but it is sufficient that the diameter of the defocus region 14 is uniform at least near the boundary between the central clear region 11 and the functional region 12 (for example, within 10 mm of the boundary with the edge of the convex polygon 20 as the boundary). The diameter of the defocus region 14 may also be different depending on the position of the functional region 12. When the diameter of the defocus region 14 is different due to the position of the functional region 12, the diameter of the defocus region 14 mentioned above refers to the diameter of the defocus region 14 near the boundary between the central clear region 11 and the functional region 12.

[0055] In this specification, the center (geometric center, centroid) of the convex polygon 20 is used as the center of the centrally sharp region 11. Furthermore, the distance *r* from the center of the convex polygon 20 to the center of the nearest defocused region 14 is used as the radius of the centrally sharp region 11. The distance *r* is preferably at least four times the distance *p* (hereinafter also referred to as the spacing *p*) between the centers of adjacent defocused regions 14. Under this condition, it is easier to reduce the outer angle of the convex polygon 20. Additionally, from the viewpoint of not excessively expanding the centrally sharp region 11 and easily obtaining the effect of suppressing myopia progression, the distance *r* is preferably five times or less of the spacing *p*. Furthermore, in this embodiment, the case where the spacing *p* of the defocused regions 14 within the functional region 12 is uniform is described. However, it is sufficient that at least the spacing *p* of the defocused regions 14 near the boundary between the centrally sharp region 11 and the functional region 12 (for example, within 10 mm of the boundary with the edge of the convex polygon 20) is uniform. The spacing *p* of the defocused regions 14 may vary depending on the location of the functional region 12. When the spacing p of the defocused region 14 varies depending on the position of the functional region 12, the aforementioned spacing p of the defocused region 14 refers to the spacing p of the defocused region 14 that exists near the boundary between the central sharp region 11 and the functional region 12.

[0056] The distance r is preferably 5.5 mm or more and 10 mm or less. Under this condition, it is easy to reduce the outer angle of the convex polygon 20, and the central clear region 11 has an appropriate size, making it easier to obtain the effect of inhibiting the progression of myopia.

[0057] The spacing p of the defocused regions 14 is preferably 1.0 mm or more and 2.5 mm or less, more preferably 1.2 mm or more and 2.0 mm or less. Under these conditions, it is easy to reduce the outer angle of the convex polygon 20, and the central clear region 11 has an appropriate size, making it easier to obtain the effect of inhibiting myopia progression, etc.

[0058] The difference between the refractive power of the defocus region 14 and the refractive power of the portion outside the defocus region 14 (e.g., the base region 13) (defocus power) is preferably 0.5D or more and 10D or less.

[0059] Defocus areas 14 may also be configured in areas other than functional areas 12, but from the viewpoint of improving the wearing comfort of the eyeglass lens 10, for example, it is preferable that more than 80% (more preferably more than 90%) of the defocus areas 14 provided by the eyeglass lens 10 are configured in the functional areas 12.

[0060] In the functional region 12, the area ratio of the defocus region 14 is preferably 30% to 60% (more preferably 40% to 60%). If the area ratio of the defocus region 14 is less than 30%, it may not be possible to sufficiently inhibit the progression of myopia. In contrast, by setting the area ratio of the defocus region 14 to 30% or more, it is possible to sufficiently inhibit the progression of myopia. On the other hand, if the area ratio of the defocus region 14 exceeds 60%, it may adversely affect the wearing comfort and appearance of the spectacle lens 10. In contrast, by setting the area ratio of the defocus region 14 to 60% or less, it is possible to maintain the wearing comfort and appearance of the spectacle lens 10.

[0061] The peripheral clear region 15 is a ring-shaped region that provides the wearer's prescribed refractive power and surrounds the functional region 12. In this embodiment, the peripheral clear region 15 performs the same function as the central clear region 11. Furthermore, since the peripheral clear region 15 is positioned along the outer periphery of the spectacle lens 10 in a manner that surrounds the functional region 12, peripheral vision is easily ensured.

[0062] By fitting the spectacle lens 10 of this embodiment into a prescribed frame, eyeglasses with spectacle lenses 10 that have the effect of inhibiting the progression of myopia can be realized. The frame of the eyeglasses of this embodiment has, for example, a vertical width of 27mm or more and 38mm or less, and a horizontal width (also referred to as lens width) of 42mm or more and 50mm or less. The above frame size is envisioned as a general frame for children. From the viewpoint of effectively obtaining the effect of inhibiting the progression of myopia, the area of ​​the functional area 12 is preferably more than half the area of ​​the frame. Furthermore, the area of ​​the central clear area 11 is preferably less than half the area of ​​the frame. To satisfy this condition, the diameter of the central clear area 11 is preferably a fraction of the vertical width of the frame. The radius of the central sharp region 11 (i.e., the distance r from the center of the convex polygon 20 to the center of the nearest defocus region 14) is preferably 9.54 mm or less, more preferably 6.75 mm or less, when the vertical width of the frame is 27 mm or more.

[0063] In eyeglasses with the spectacle lens 10 of this embodiment, it is preferable to adjust the apparent central clear area 11 by slightly moving the spectacle lens 10 away from the eye during the fitting process. When the central clear area 11 is slightly enlarged to reduce the ghosting sensation at the boundary between the central clear area 11 and the functional area 12, adjusting the apparent central clear area 11 by slightly moving the spectacle lens 10 away from the eye during the fitting process can adjust the central clear area 11. In this case, the risk of the spectacle lens 10 touching eyelashes or the like can be reduced, which is therefore preferable.

[0064] As the lens substrate constituting the spectacle lens 10, various commonly used lens substrates can be used. The lens substrate can be, for example, a plastic lens substrate or a glass lens substrate. The glass lens substrate can be, for example, a lens substrate made of inorganic glass. From the viewpoint of being lightweight and not easily broken, a plastic lens substrate is preferred as the lens substrate. Examples of plastic lens substrates include (meth)acrylic resin, styrene resin, polycarbonate resin, allyl resin, diethylene glycol dielyl carbonate resin (CR-39), and other allyl carbonate resins, vinyl resins, polyester resins, polyether resins, polyurethane resins obtained by reacting isocyanate compounds with hydroxyl compounds such as diethylene glycol, thiourethane resins obtained by reacting isocyanate compounds with polythiols, and cured products (commonly referred to as transparent resins) obtained by curing a curable composition containing a (thio)epoxy resin compound having one or more disulfide bonds within its molecule. The curable composition can also be referred to as a polymeric composition. As the lens substrate, an undyed lens substrate (colorless lens) or a dyed lens substrate (dyed lens) can be used. The thickness of the lens substrate is not particularly limited; for example, the thickness (center thickness) can be approximately 1–30 mm. The refractive index of the lens substrate can be, for example, approximately 1.60–1.75. However, the refractive index of the lens substrate is not limited to this range; it can be within this range, or higher or lower. In this specification, the refractive index refers to the refractive index for light with a wavelength of 500 nm.

[0065] (2) Variations, etc.

[0066] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments and various modifications can be made without departing from its spirit.

[0067] In the above embodiments, the effect of spectacle lens 10 in inhibiting the progression of myopia has been described. However, by changing the defocus region 14 (convex region) to a concave region, for example, the present invention can also be applied to spectacle lenses that reduce hyperopia and eyeglasses having such spectacle lenses.

[0068] Furthermore, for example, the present invention can be widely applied to spectacle lenses of similar form that provide different stimulation to the retina than that provided by the naked eye or a single-focus lens by altering defocus and contrast characteristics. For example, it can also be applied to spectacle lenses intended to improve glaucoma by providing stronger defocus stimulation to improve retinal blood flow, and to eyeglasses incorporating such spectacle lenses.

[0069] Furthermore, for example, the present invention can also be applied to clip-on lenses mounted on eyeglass frames. Compared to standard eyeglasses, clip-on lenses are prone to larger fitting errors. In particular, if simply applied to existing myopia progression-inhibiting lenses, the boundary between the central clear area and the functional area may differ from the original design position, or the boundary positions for the left and right eyes may differ, leading to discomfort. That is, discomfort caused by double vision in unexpected areas or different double vision sensations in the left and right eyes. In contrast, in the present invention, since the double vision sensation at the boundary between the central clear area and the functional area is suppressed, the discomfort associated with the above-mentioned problems is reduced.

[0070] Furthermore, the myopia progression suppression lenses (including clip-on lenses) of the present invention can also be used for trial fitting before prescription of myopia progression suppression lenses or for verifying the effectiveness of myopia progression suppression. As a method for verifying the effectiveness of myopia progression suppression lenses, Lisa A. Ostrin et al.'s "IMI - The Dynamic Choroid: New Insights, Challenges, and Potential Significance for Human Myopia" shows that short-term choroidal changes can serve as clues to inferring the myopia suppression effect. Furthermore, one specific step based on the above hypothesis is shown in Zeeshan Akhtar et al.'s "Short-term effect of simultaneous negative and positive defocus on axial length, and choroidal thickness in the human myopic eye." Different lenses are worn in the left and right eyes, and the choroidal thickness and axial length are measured after 60 minutes, evaluating the changes over time relative to pre-measured values. Based on the differences between the left and right eyes over time, the differences in myopia suppression effects of the lenses worn in the left and right eyes can be inferred. In the aforementioned literature, a comparison was made between the left eye wearing a monofocal lens and the right eye wearing a myopia progression suppression lens. If existing myopia progression suppression lenses were used in this experiment, only the right eye experienced double vision caused by the boundary between the central clear area and the functional area, easily leading to discomfort due to left-right imbalance. This discomfort was suppressed by replacing the right eye with the myopia progression suppression lens of the present invention (e.g., clip-on type), which inherently has less double vision. Furthermore, to directly compare multiple myopia progression suppression lenses, it is also possible to consider using myopia progression suppression lenses with different designs (e.g., different sizes or shapes of the central clear area) for both eyes and employing the above method. In this case, if existing myopia progression suppression lenses were used, discomfort would arise due to the imbalance in double vision caused by the different boundary areas between the left and right eyes; however, this discomfort was suppressed by replacing them with the myopia progression suppression lens of the present invention, which inherently has less double vision.

[0071] Furthermore, in cases involving trial fitting or verification of the effectiveness of inhibiting myopia progression as described above, instead of installing clip-on lenses on eyeglass frames, an optometric lens having the same configuration (central clear area and functional area) as the myopia progression-inhibiting lens of this invention can be inserted into an optometric frame. While the boundary between the central clear area and the functional area can easily change significantly due to the insertion position within the optometric frame, presenting the same problem as with clip-on lenses, it can be resolved for the same reasons.

[0072] Example

[0073] Next, embodiments of the present invention will be described. These embodiments are examples of the present invention, and the present invention is not limited to these embodiments.

[0074] In this embodiment, spectacle lenses of samples 1 to 5 were designed as spectacle lenses to inhibit the progression of myopia. Figure 6 This is a magnified top view of the area near the eye point of the spectacle lenses of samples 1-5. Figure 6 The diagram shows a convex polygon as described in the above embodiments.

[0075] The common structure of the spectacle lenses in samples 1 to 5 is as follows.

[0076] Lens substrate: PC (polycarbonate)

[0077] • Refractive index of the lens substrate: 1.589

[0078] • Prescription refractive power (spherical refractive power): 0.00D

[0079] • Prescription refractive power (astigmatic refractive power): 0.00D

[0080] • Shape of the out-of-focus area: spherical (circular in top view)

[0081] • The surface on which the out-of-focus area is formed: the side surface of the object.

[0082] • Height of the out-of-focus area: 1μm

[0083] In the spectacle lenses of samples 1-3, the defocused areas are arranged in a rectangular coordinate system where the X and Y directions intersect at 60 degrees, with a spacing p of 2 mm and a diameter of 1.4 mm. Furthermore, in the spectacle lenses of samples 4 and 5, the defocused areas are arranged in a rectangular coordinate system where the X and Y directions intersect at 90 degrees, with a spacing of 1.4 mm and a diameter of 1 mm.

[0084] In Sample 1, the distance r from the center of the convex polygon to the center of the nearest defocused region was designed to be 3 times the spacing p of the defocused regions (=6mm). As a result, the maximum value of the exterior angle of the convex polygon was 60 degrees.

[0085] In Sample 2, the distance r from the center of the convex polygon to the center of the nearest defocused region was designed to be 3.46 times the distance p between the defocused regions (=6.92mm). As a result, the maximum value of the exterior angle of the convex polygon was 60 degrees.

[0086] In sample 3, the distance r from the center of the convex polygon to the center of the nearest defocused region was designed to be 4 times the distance p between the defocused regions (=8mm). As a result, the maximum value of the exterior angle of the convex polygon was 36 degrees.

[0087] In sample 4, the distance r from the center of the convex polygon to the center of the nearest defocused region was designed to be 4.12 times the distance p between the defocused regions (=5.77mm). As a result, the maximum value of the exterior angle of the convex polygon was 26.6 degrees.

[0088] In sample 5, the distance r from the center of the convex polygon to the center of the nearest defocused region was designed to be 5 times the spacing p of the defocused regions (=7mm). As a result, the maximum value of the exterior angle of the convex polygon was 45 degrees.

[0089] Figure 7 This indicates that among the spectacle lenses in samples 1-5, from Figure 6 When the defocused area indicated by the arrow is rotated 2mm along the edge of the convex polygon, for... Figure 2 The simulation results show how the original image would appear blurred. Furthermore, this was demonstrated by presenting the simulation to multiple subjects. Figure 7 The images shown were compared with the visual perception test. The results showed that for sample 3, where the maximum value of the exterior angle of the convex polygon was 36 degrees, and for sample 4, where the maximum value of the exterior angle of the convex polygon was 26.6 degrees, most subjects answered that they did not easily perceive the ghosting.

[0090] As described above, it has been confirmed that by designing the maximum value of the exterior angle of the convex polygon described in the above embodiments to be less than 36 degrees, even if the configuration of the defocus area is of the Cartesian coordinate system type, it is possible to achieve eyeglass lenses that do not easily cause a ghosting sensation at the boundary between the central clear area and the functional area.

[0091] Symbol Explanation

[0092] 10: Eyeglass lenses

[0093] 11, 110: Clear central area;

[0094] 12, 120: Functional areas;

[0095] 13, 130: Basal region;

[0096] 14, 140: Out-of-focus areas;

[0097] 15: The surrounding area is clearly defined;

[0098] 20, 200: Convex polygons.

Claims

1. A spectacle lens, comprising: A clear central area that provides the wearer with their prescribed refractive power, including the ocular point; and A ring-shaped functional area surrounds the central clearly defined area. The functional region includes: a basal region that achieves the prescribed refractive power; and multiple defocus regions that have refractive powers different from the prescribed refractive power. When viewed from above, the plurality of defocused areas are arranged along the X direction and the Y direction, which intersects the X direction at a predetermined angle. When viewed from above, assuming that the center of the defocused region does not exist inside the convex polygon with the following virtual line as its side and the area of ​​the convex polygon is at its maximum, the maximum value of the exterior angle of the convex polygon is less than 36 degrees, and the virtual line passes through the boundary portion of the central sharp region and the functional region, there are two or more centers of the defocused region.

2. The spectacle lens according to claim 1, wherein, The diameter of the defocused area is greater than 0.5 mm and less than 2.5 mm.

3. The spectacle lens according to claim 1, wherein, The distance r from the center of the convex polygon to the center of the nearest defocused region is more than 4 times the distance p between the centers of adjacent defocused regions.

4. The spectacle lens according to claim 1, wherein, The distance r from the center of the convex polygon to the center of the nearest defocused region is less than 5 times the distance p between the centers of adjacent defocused regions.

5. The spectacle lens according to claim 1, wherein, The distance r from the center of the convex polygon to the center of the nearest defocused region is greater than 5.5 mm and less than 10 mm.

6. The spectacle lens according to any one of claims 1 to 5, which has the effect of inhibiting the progression of myopia or reducing hyperopia.

Images