Spectacle lens for suppressing refractive error deepening

Abstract

Provided is a spectacle lens for suppressing the depth of refractive error, the spectacle lens having a high ability to suppress the depth of refractive error and having a prescribed refractive power for normal refractive correction. A spectacle lens having optical regions (23) around an optical center region (22), the optical regions (23) having a refractive power different from that of the optical center region (22) to which a predetermined refractive power for refractive correction is applied, the optical regions (23) being continuously arranged in a grid shape around a plurality of island-shaped regions (24), and the optical regions (23) having a refractive power different from that of the optical center region (22). The plurality of island-shaped regions (24) have the same refractive power as the refractive power of the optical center region (22) and are arranged so as to be discrete from each other.

Description

Technical Field

[0001] The present invention relates to an eyeglass lens for suppressing the progression of refractive error, the lens having two areas with different focal lengths, the two areas being an optical center area that is given a specified refractive power for refractive correction, and an optical area that is used to suppress the progression of refractive error but does not participate in refractive correction. Background Art

[0002] In order to suppress the deepening of the wearer's refractive error, a spectacle lens has been proposed in the past, in which an optical element (optical area) having a function of not focusing on the retina is arranged in a concentric circle area around the optical center. As an example of such a spectacle lens, reference document 1 is cited. In reference document 1, for example, as shown in FIG. 12 thereof, a ring 14 formed by connecting microlenses is arranged on the concentric circles. The part of the microlens is an area where the refractive power is significantly different from that of the other parts. The part of the microlens acts as an optical area that helps to suppress the deepening of the refractive error. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Publication No. 2021-524051 Summary of the invention Technical issues to be solved by the invention

[0004] However, in the existing spectacle lenses for suppressing the deepening of refractive errors, the design is basically based on the area of ​​the glasses for refractive correction, and the optical area for suppressing the deepening of refractive errors is only provided as an auxiliary function, so the ability to suppress the deepening of refractive errors is insufficient. Therefore, it is desired to provide a spectacle lens for suppressing the deepening of refractive errors, which has a high ability to suppress the deepening of refractive errors and has a prescribed refractive power for general refractive correction. Technical solutions adopted to solve technical problems

[0005] In order to solve the above technical problems, in scheme one, there is an optical area around the optical center area, the optical area has a refractive power different from the optical center area that is given a prescribed refractive power for refractive correction, and the optical area is continuously arranged in a grid around a plurality of island-shaped areas, and the plurality of island-shaped areas have the same refractive power as the optical center area and are discretely arranged with each other. With the above-mentioned eyeglass lens, since the optical area for suppressing the deepening of refractive error is continuously arranged in a grid shape outside the optical center area for refractive correction, the area where the focal depth is extended can be continuous and not easily interrupted. Therefore, a eyeglass lens for suppressing the deepening of refractive error with a better effect of suppressing the deepening of refractive error can be provided.

[0006] The "optical zone" is an area that is arranged around the optical center area and has a different refractive power from the optical center area, and the optical center area is given a prescribed refractive power for refractive correction. In addition, the optical zone is an area whose focal depth is extended more than the optical center area (and the area with the same refractive power as the optical center area) due to astigmatism, thereby suppressing the deepening of refractive errors. Therefore, the optical zone has positive refractive power in various directions, so that part of the light passing through is imaged at a position outside the retina. Based on Figure 5 , an overview of depth of focus is described. Figure 5 This is a simulated diagram of a cross section of the optical path of light passing through the spectacle lens 11 between the spectacle lens 11 of the present invention and the eyeball 12 of the wearer wearing the spectacle lens 11, and through the optical axis of the eyeball 12. The spectacle lens 11 can focus on the retina in an area having the same refractive power as the optical center area 13 that is assigned a prescribed refractive power for refractive correction. On the other hand, since the optical area 14 is assigned a refractive power different from that of the optical center area, light passing through the optical area 14 toward the retina will have a depth of focus due to astigmatism. Figure 5 In the embodiment, the optical zone 14 is in a state of being given a relatively positive refractive power relative to the optical center zone 13, so the light passing through this zone is in a state of having its focal depth extended to be further inside than the retina. The focal range that is smaller than a certain range of the point image distribution range on the imaging plane that is straight with the light is called the focal depth. Here, since a relatively positive refractive power is given, the focus is focused on the inside, and the focal depth is extended to be further inside than the retina. However, if the refractive power of the optical zone 14 causes the focus to be focused on the outside of the retina, then the focal depth may also extend to be further outside than the retina.

[0007] For example, the optical region may be Figure 6 (a) Figure 6 As shown in (c), the surface extending from the curve of the optical center area is further protruded, and the optical area can also be as shown in Figure 6 As shown in (b), the surface extending the curve of the optical center area is slightly deformed. In addition, it is not necessarily necessary to form a raised structure like an actual island. For example, it can be Figure 6 As shown in (a), on the extension of the curve located in the optical center area (on the base surface), it can also be as follows Figure 6 As shown in (b), it is formed at a position slightly lower than the base surface of the curve extension relative to the optical center area. In addition, you can Figure 6 As shown in (c), the curve relative to the optical center area is further protruded through the extended base surface and formed into an island-shaped area, for example, Figure 6 As shown in (d), it protrudes outward (is more bulging) relative to the optical area and forms an island-like area. That is, the island-shaped region can be raised like an actual island, but it does not necessarily have to be raised like an island. The key is to form a small region surrounded by the optical region and independent of each other. The junction between the island-shaped region and the optical region is preferably formed into a smooth curve. The shape of the optical zone can be as follows Figure 7 The overall shape is a cylindrical curve as shown in the cross section (a) of FIG. 1 , or it may be as shown in FIG. Figure 7 As shown in the cross section (b), only the inclined surface is in a cylindrical curved shape.

[0008] The eyeglass lens of the present invention can be processed by cutting a semi-finished blank as a precursor lens by, for example, using a processing device such as a numerical control device, inputting processing data, and controlling a computer through a program. In addition, it can also be manufactured by, for example, using a lens mold for eyeglass lenses and by resin molding. In addition, since the semi-finished blank itself is manufactured by molding, the semi-finished blank can also be combined with cutting. For example, an optical area can be formed on either the front or back side of the lens by molding, and the other side can be cut according to the lens diopter of the wearer. For example, when the optical area is formed on the lens surface by molding, the back side of the lens can also be processed according to the lens diopter of the wearer.

[0009] In addition, in the second solution, the refractive error deepening suppression area formed by the above-mentioned optical area and multiple island-shaped areas interlaced surrounds the above-mentioned optical center area in a ring manner. By surrounding as described above, the ametropia enhancement suppression region is formed to be rotationally symmetrical, thereby being able to reduce various unnecessary aberrations that may occur in the lens. Furthermore, in the third embodiment, the interval between the inner diameter and the outer diameter of the annular ametropia enhancement suppression region is set to 1 to 20 mm. The above-mentioned interval (that is, the width of the ametropia deepening suppression area) can be formed. If the ametropia deepening suppression area is less than 1 mm, the human eye may not be able to perceive the extension of the depth of focus. On the other hand, if the area is more than 20 mm, when the pupil is constricted, the refractive correction of the area having the same refractive power as the optical center area may be hindered. Furthermore, in the fourth aspect, the outer diameter of the annular refractive error enhancement suppression region is set to be greater than or equal to 30 mm.

[0010] Furthermore, in the fifth solution, the optical region has a negative refractive power of more than -1.0D relative to the refractive power of the optical center in terms of the equivalent spherical refractive power. Furthermore, in the sixth embodiment, the optical region has a positive refractive power of +1.0D or more relative to the refractive power of the optical center in terms of equivalent spherical refractive power. Furthermore, in the seventh aspect, the plurality of island-shaped regions are arranged regularly at equal intervals from each other. Furthermore, in the eighth aspect, the island-shaped region is configured to have a polygonal shape when viewed from above. The polygonal shape may be, for example, a triangle to an octagon, and a plurality of island-shaped regions may be formed by combining polygons of different shapes. By combining, the optical regions may be arranged in a grid-like manner in a balanced manner. The polygonal shape may be a regular polygon. Furthermore, in the ninth aspect, the island-shaped region is configured to have a regular hexagonal shape when viewed from above. By forming the island-like regions into a regular hexagonal shape, a regular grid pattern can be formed by connecting the island-like regions at an angle of 120 degrees.

[0011] The inventions shown in the above schemes can be combined arbitrarily. For example, all or part of the structure of the invention shown in scheme one can be combined with at least a part of the structure of at least one invention in scheme two and thereafter. In particular, the invention shown in scheme one can be combined with a part of the structure of at least one invention in scheme two and thereafter to form a new invention. In addition, any structure can be extracted from the inventions shown in schemes one to nine, and the extracted structures can be combined. The applicant of this application reserves the right to apply for a patent for the invention containing the above structure. Effects of the Invention

[0012] With the eyeglass lens for suppressing the deepening of refractive error of the present invention, since the optical area for suppressing the deepening of refractive error is continuously arranged in a grid shape outside the optical center area for refractive correction, the area where the focal depth is extended can be continuous and not easily interrupted. Therefore, it is possible to provide an eyeglass lens for suppressing the deepening of refractive error with a better effect of suppressing the deepening of refractive error. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a plan view illustrating an enlarged optical region outside the optical center region in the spectacle lens according to the embodiment of the present invention. Figure 2This is a partial enlarged view showing a part of the ametropia enhancement suppression area where the optical area and the island-shaped area are interlaced. Figure 3 (a) is correct Figure 2 An explanatory diagram for explaining the outer contour shapes of the optical region and the island-shaped region in the cross section shown by the AA line, Figure 3 (b) is correct Figure 2 An explanatory diagram for explaining the outer contour shapes of the optical region and the island-shaped region in the cross section shown by the BB line. Figure 4 This is a stereoscopic diagram showing an enlarged representation of a part of the ametropia enhancement suppression region in which the optical region and the island-shaped region are interlaced. Figure 5 This is an explanatory diagram schematically explaining the outline of the depth of focus in the spectacle lens according to the embodiment of the present invention. Figure 6 (a) to (d) are explanatory diagrams for explaining the positional relationship with respect to the lens curve when the optical area and the island-shaped area are formed. Figure 7 (a) and (b) are cross-sectional views illustrating an example of the shape of the optical zone. DETAILED DESCRIPTION

[0014] Hereinafter, specific embodiments of the spectacle lens will be described with reference to the accompanying drawings. Figure 1 The spectacle lens 21 for suppressing the deepening of refractive error shown (hereinafter also referred to as the spectacle lens 21) is a single focus (SV) lens of a biconvex shape with a circular shape, which is formed by using a lens mold and manufactured by resin molding, and is called a round lens before being put into a frame for processing. The base curve is set to the surface side of the lens. The spectacle lens 21 is cut to match the frame shape (spherical shape) according to the needs of the user at the manufacturer or the optical shop. Basic information of the spectacle lens 21 of the present embodiment is as follows. Radius of curvature of base (surface) = 163.44 mm The radius of curvature of the back of the lens = 105.56mm The lens power of the optometry is S2.00D C0.00D The optical center area 22 of the eyeglass lens 21 is endowed with a refractive power that matches the wearer's optometry. Around the optical center area 22 and on the lens surface, an annular refractive error deepening suppression area 25 formed by interlacing an optical area 23 and a plurality of island-shaped areas 24 is arranged. In this embodiment, the diameter of the optical center area 22 is 10 mm, the ring width of the annular refractive error deepening suppression area 25 is 12.5 mm, and the outer diameter of the ring is 35 mm.

[0015] The optical area 23 is composed of a cylindrical, ridge-shaped long lens portion 26 arranged on each side of an island-shaped area 24 formed into a regular hexagonal shape, and joined at an angle of 120 degrees in the center of the island-shaped area 24 located at the position of three regular triangles, so that the whole is connected in a grid shape. like Figure 3 As shown in (a), each long lens portion 26 is formed into a dome-shaped convex lens shape in the AA section direction (cross-sectional direction), such as Figure 3 As shown in (b), each long lens portion 26 is formed to be the same height in the BB section direction (longitudinal section direction), and each long lens portion 26 is formed as a whole into a cylindrical structure and a long ridge shape. In this embodiment, the refractive power of the long lens portion 26 is designed to have a positive cylindrical refractive power of about +9.0D relative to the refractive power of the optical center. The width of the long lens portion 26 is set to be approximately 300 μm, and it is formed to protrude approximately 0.3 μm upward (outward) based on the curved surface extending from the optical center region 22. The optical region 23 is not a region for refractive correction but a region for suppressing the deepening of refractive error. The island-shaped region 24 has the same curve (refractive power) as the optical center region 22 and becomes a portion for refractive correction. like Figure 2 and Figure 3 As shown, a plurality of island-shaped regions 24 are arranged in a staggered manner with the optical region 23 and at equal intervals in the vertical and horizontal directions. One side of the island-shaped region 24 formed in a regular hexagonal shape is approximately 600 μm. The island-shaped region 24 is formed on a curved surface extending from the optical center region 22, and its refractive power is the same as that of the optical center region 22. like Figure 2 and Figure 3 As shown, a plurality of island-shaped regions 24 are arranged in a staggered manner with the optical region 23 and at equal intervals in the vertical and horizontal directions. One side of the island-shaped region 24 formed in a regular hexagonal shape is approximately 600 μm. The island-shaped region 24 is formed on a curved surface extending from the optical center region 22, and its refractive power is the same as that of the optical center region 22.

[0016] like Figure 2 and Figure 3As shown, a plurality of island-shaped areas 24 are neatly arranged in the vertical and horizontal directions in a staggered manner with the optical area 23 and at equal intervals. One side of the island-shaped area 24 formed in the shape of a regular hexagon is approximately 600 μm. The island-shaped area 24 is formed on a curved surface extending from the optical center area 22, and its refractive power is the same as that of the optical center area 22. After comparing the wearing feel of the two, it was found that the spectacle lens 21 of the embodiment has an irregular shape of the optical area with positive refractive power, so when looking at close objects, the visual effect is very different from that observed through a positive refractive power lens. This design enables the lens accommodation function to be fully utilized and shows the effect of reducing the image formed behind the retina (which is considered to be one of the causes of myopia). Therefore, it can be concluded that this design is more likely to achieve the effect of suppressing the deepening of refractive errors.

[0017] The above-mentioned embodiments are only recorded as specific embodiments for illustrating the principle and concept of the present invention. That is, the present invention is not limited to the above-mentioned embodiments. The present invention can also be embodied as, for example, the following modified forms. The size (diameter) of the optical center area 22 and the width of the optical area 23 in the above embodiment can be changed appropriately. In addition, the lens diameter can also be changed appropriately, and as the lens diameter changes, the size (diameter) of the optical center area 22 and the width of the optical area 23 can also be changed appropriately. The above is just an example, and the sizes of the optical region 23 and the island-shaped region 24 may be changed as appropriate. The island-shaped regions 24 in the above embodiment are regular hexagonal shapes, but may be other new shapes as long as they do not hinder the lens effect of the optical region 23. For example, the island-shaped regions 24 may be circular, regular triangles, regular pentagons, or a combination of different shapes. In the above embodiment, the island-shaped region 24 has the same height as the optical center region 22, but the island-shaped region 24 and the optical center region 22 may have different heights as long as they have the same refractive power. For example, the optical region 23 may be designed to have substantially the same height as the optical center region 22, and may be recessed relative to the optical center region 22 to form the island-shaped region 24, or may be protruding relative to the optical center region 22 to form the island-shaped region 24. In the embodiment, the case where the depth of focus is on the positive side is described, but the same design concept can also be used for the case where the depth of focus is on the negative side. In addition, the corrected refractive power in the above content is a negative refractive power lens, but it can also be a positive refractive power lens.

[0018] The present invention is not limited to the structures described in the above-mentioned embodiments. The constituent elements of the above-mentioned embodiments and variants may be arbitrarily selected and combined. In addition, any constituent element of each embodiment and variant and any constituent element described in the solution of the present invention or any constituent element described in the solution embodying the present invention may be arbitrarily combined. For the above-mentioned combination, it is also hoped that these rights can be obtained by modifying the present application or applying for a divisional application. In addition, it is also hoped that these rights can be obtained by changing the application to an appearance application, thereby obtaining the overall appearance or partial appearance. The drawings depict the entire device with solid lines, but the drawings include not only the overall design, but also the partial design of the local parts of the device. For example, the drawings include certain parts of the device as partial appearance, and certain parts of the device as partial appearance that are not related to the components. The local part of the device can also be a local component of the device, or a part of the component. Explanation of symbols

[0019] 21 ... spectacle lens for suppressing the deepening of refractive error, 22 ... optical center area, 23 ... optical area, 24 ... island-shaped area.

Claims

1. A spectacle lens for suppressing the deepening of refractive error, characterized in that: An optical region is provided around an optical center region, wherein the optical region has a refractive power different from that of the optical center region to which a prescribed refractive power for refractive correction is assigned, and the optical region is continuously arranged in a grid pattern around a plurality of island-shaped regions, wherein the plurality of island-shaped regions have a refractive power the same as that of the optical center region and are discretely arranged with respect to each other.

2. The eyeglass lens for suppressing the progression of refractive error according to claim 1, wherein: A refractive error enhancement suppression area formed by alternating the optical area and a plurality of the island-shaped areas surrounds the optical center area in a ring-like manner.

3. The eyeglass lens for suppressing the progression of refractive error according to claim 2, wherein: The interval between the inner diameter and the outer diameter of the annular refractive error enhancement suppression area is set to 1 to 20 mm.

4. The eyeglass lens for suppressing the progression of refractive error according to claim 2, wherein: The outer diameter of the annular refractive error enhancement suppression area is 30 mm or more.

5. The eyeglass lens for suppressing the progression of refractive error according to claim 2, wherein: The optical zone has a negative refractive power of -1.0D or more relative to the refractive power of the optical center in terms of equivalent spherical refractive power.

6. The eyeglass lens for suppressing the progression of refractive error according to claim 2, wherein: The optical zone has a positive refractive power of more than +1.0D relative to the refractive power of the optical center in terms of equivalent spherical refractive power.

7. The spectacle lens for suppressing ametropia from getting worse according to any one of claims 1 to 6, characterized in that: The plurality of island-shaped regions are arranged regularly at equal intervals from each other.

8. The eyeglass lens for suppressing ametropia from getting worse according to claim 7, wherein: The island-shaped region is configured to have a polygonal shape in a plan view.

9. The eyeglass lens for suppressing the progression of refractive error according to claim 8, characterized in that: The island-shaped regions are configured to have a regular hexagonal shape in a plan view.

Images