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
second refraction areas 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,
the second refraction areas are non-concentrically formed as a plurality of respectively independent island-shaped areas near a center of the spectacle lens, the second refraction areas occupy less than 80% of a surface of the spectacle lens, and
the first refraction area is formed as the area other than the areas formed as the second refraction areas.
2. The spectacle lens according to claim 1 , wherein a ratio of total area of the second refraction areas, with respect to the total areas of the second refraction areas and the first refraction area, is 20 to 60% in an area formed by a mixture of the second refraction areas and the first refraction area.
3. The spectacle lens according to claim 1 , wherein the second refraction areas are formed into circular shapes.
4. 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.
5. The spectacle lens according to claim 1 , wherein the spectacle lens is the spectacle lens having 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.
6. The spectacle lens according to claim 5 , wherein the area of each independent island-shaped second refraction area is 0.50 to 3.14 mm 2 .
7. The spectacle lens according to claim 5 , wherein the second refraction areas are formed into circular shapes.
8. The spectacle lens according to claim 1 , wherein the spectacle lens is the spectacle lens having 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.
9. The spectacle lens according to claim 8 , wherein the area of each independent island-shaped second refraction area is 0.50 to 3.14 mm 2 .
10. The spectacle lens according to claim 8 , wherein the second refraction areas are formed into circular shapes.
11. The spectacle lens according to claim 1 , wherein the second refraction areas are formed in a circular area having a radius of 20 mm, with an optical center of the spectacle lens as a center of the circular area.
12. The spectacle lens according to claim 11 , wherein the second refraction areas are not formed in a circular area having a radius of 2.5 to 10.0 mm and an optical center of the spectacle lens as its center.
13. The spectacle lens according to claim 1 , wherein the second refraction areas are not formed in a circular area having a radius of 2.5 to 10.0 mm, with an optical center of the spectacle lens as a center of the circular area.
14. The spectacle lens according to claim 13 , wherein a ratio of total area of the second refraction areas, with respect to the total areas of the second refraction areas and the first refraction area, is 20 to 60% in an area formed by a mixture of the second refraction areas and the first refraction area.
15. 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.
16. The spectacle lens according to claim 15 , 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.
17. The spectacle lens according to claim 1 , wherein the area of each independent island-shaped second refraction area is 0.50 to 3.14 mm 2 .
18. The spectacle lens according to claim 17 , wherein the second refraction areas are formed in a circular area having a radius of 20 mm, with an optical center of the spectacle lens as a center of the circular area.
19. The spectacle lens according to claim 17 , wherein a diameter of each circular-shaped circle is 0.8 to 2.0 mm.
20. The spectacle lens according to claim 19 , 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.