Spectacle lens and method of using a spectacle lens
A spectacle lens can inhibit ametropia of the eyes and ensure full visibility. The spectacle lens comprises: first refraction areas and second refraction areas. Each first refraction area has a first refraction force that may be based on a prescription for correcting the ametropia of the eyes. Each second refraction area has a refraction force different from the first refraction force and may function to focus images on the positions except the retina of the eyes, to inhibit the development of the ametropia. Near the central part of the lens, the second refraction areas form a plurality of independent island-shaped areas, and the first refraction areas form the areas beyond the areas of the second refraction areas.
1. A spectacle lens comprising:
a first refraction area having a first refractive power based on a prescription for correcting an abnormal refraction of an eye; and
a plurality of second refraction areas, each having a refractive power different from the first refractive power, and having a function of focusing an image on a position other than a retina of the eye so as to suppress a progress of the abnormal refraction of the eye,
wherein the second refraction areas are dispersedly arranged as a plurality of mutually separate areas, and
wherein each of the plurality of second refraction areas is surrounded by the first refraction area.
2. The spectacle lens according to claim 1 , wherein the spectacle lens has a function of suppressing a progress of myopia, and the second refraction areas have a refractive power obtained by adding a positive refractive power to the first refractive power.
3. The spectacle lens according to claim 1 , wherein the spectacle lens has a function of suppressing a progress of hyperopia, and the second refraction areas have a refractive power obtained by adding a negative refractive power to the first refractive power.
4. The spectacle lens according to claim 1 , wherein the second refraction areas are arranged within a circular area having a radius of 20 mm, with an optical center of the spectacle lens being a center of the circular area.
5. The spectacle lens according to claim 1 , wherein the second refraction areas are absent from a circular area having a radius of 2.5 to 10.0 mm, with an optical center of the spectacle lens being a center of the circular area.
6. The spectacle lens according to claim 1 , wherein a ratio of total area of the plurality of second refraction areas, with respect to the total areas of the plurality of second refraction areas and the first refraction area, is 20 to 60%.
7. The spectacle lens according to claim 1 , wherein each of the plurality of second refraction areas is formed as a circular shape.
8. The spectacle lens according to claim 1 , wherein the second refraction areas have the refractive power different from the refractive power of the first refraction area by being made of a material different from the material of the first refraction area.
9. The spectacle lens according to claim 1 , wherein a surface of each of the plurality of second refraction areas is formed as a convex or concave shape, with respect to a surface of the first refraction area, at an object side of the spectacle lens.
10. The spectacle lens according to claim 1 , wherein at least some of the plurality of second refraction areas are arranged in different respective directions relative to an optical center of the spectacle lens.
11. The spectacle lens according to claim 1 , wherein the second refraction areas are arranged non-concentrically with respect to each other.
12. The spectacle lens according to claim 1 , wherein the area of each of the plurality of second refraction areas is 0.50 to 3.14 mm 2 .
13. The spectacle lens according to claim 12 , wherein a diameter of each of the plurality of second refraction areas is 0.8 to 2.0 mm.
14. The spectacle lens according to claim 1 , wherein the refractive power of the second refraction areas is differentiated from the refractive power of the first refraction area by differentiating surface shapes of the second refraction areas from a surface shape of the first refraction area.
15. The spectacle lens according to claim 14 , wherein the surface shapes of the second refraction areas are formed into convex or concave shapes toward an object side, with respect to the surface shape of the first refraction area.
16. A method of using a spectacle lens, the method comprising:
at a first time, with a first refraction area of the spectacle lens, forming an image of an object on a retina of an eye; and
at the first time, with each of a plurality of second refraction areas of the spectacle lens, forming an image on a point in front of the retina so as to suppress a progress of an abnormal refraction of the eye,
wherein the first refraction area has a first refractive power based on a prescription for correcting the abnormal refraction of the eye, and
wherein each of the plurality of second refraction areas has a refractive power different from the first refractive power and is surrounded by the first refraction area, and
wherein the second refraction areas are dispersedly arranged as a plurality of mutually separate areas.
17. The method according to claim 16 , wherein at least some of the plurality of second refraction areas are arranged in different respective directions relative to an optical center of the spectacle lens.
18. The method according to claim 16 , wherein a surface of each of the plurality of second refraction areas is formed as a convex or concave shape, with respect to a surface of the first refraction area, at an object side of the spectacle lens.
19. The method according to claim 16 , wherein the second refraction areas are arranged within a circular area having a radius of 20 mm, with an optical center of the spectacle lens being a center of the circular area.
20. The method according to claim 16 , wherein the second refraction areas are absent from a circular area having a radius of 2.5 to 10.0 mm, with an optical center of the spectacle lens being a center of the circular area.
21. The method according to claim 16 , wherein each of the plurality of second refraction areas is formed as a circular shape.
22. The method according to claim 16 , wherein the second refraction areas are arranged non-concentrically with respect to each other.