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 for suppressing a progress of ametropia comprising:
a first refraction area having a first refractive power based on a prescription of a patient; and a plurality of second refraction areas each having a refractive power different from the first refractive power,
each of said second refraction area being formed into a convex shape that extends from an object side surface of the spectacle lens and having a larger curvature than a curvature of an object side surface of the first refraction area so that a refractive power of the second refraction areas is larger than the first refractive power of the first refraction area,
wherein the plurality of second refraction areas is arranged so that there is no second refraction area is formed in a circular area having a radius of 2.5 to 10.0 mm centered on the optical center of the spectacle lens.
2. The spectacle lens according to claim 1 , wherein an area of each second refraction area is 0.50 to 3.14 mm 2 .
3. The spectacle lens according to claim 1 , wherein the second refraction areas are arranged in a circular area having a radius of 20 mm centered on the optical center of the spectacle lens.
4. 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.
5. The spectacle lens according to claim 1 , wherein each of the second refraction areas are formed into circular shapes.
6. The spectacle lens according to claim 5 , wherein a diameter of each circular shaped circle is 0.8 to 2.0 mm.
7. The spectacle lens according to claim 1 , wherein said ametropia comprises myopia.
8. The spectacle lens according to claim 1 , wherein said first refraction area are formed as the area other than the areas formed as the second refraction areas.
9. The spectacle lens according to claim 1 , wherein the second refraction areas are formed for having a function of focusing an image on a position other than a retina of the patient.
10. The spectacle lens according to claim 1 further comprises third refraction areas having the third refractive power which is different from the first refractive power and the second refractive power.
11. Spectacles which comprises a spectacle lens, said spectacle lens comprising:
a first refraction area having a first refractive power based on a prescription of a patient; and a plurality of second refraction areas each having a refractive power different from the first refractive power,
each of said second refraction area being formed into a convex shape that extends from an object side surface of the spectacle lens and having a larger curvature than a curvature of an object side surface of the first refraction area so that a refractive power of the second refraction areas is larger than the first refractive power of the first refraction area,
wherein the plurality of second refraction areas is arranged so that there is no second refraction area is formed in a circular area having a radius of 2.5 to 10.0 mm centered on the optical center of the spectacle lens.
12. The spectacles according to claim 11 , wherein an area of each second refraction area is 0.50 to 3.14 mm 2 .
13. The spectacles according to claim 11 , wherein the second refraction areas are arranged in a circular area having a radius of 20 mm centered on the optical center of the spectacle lens.
14. The spectacles according to claim 11 , wherein each of the second refraction areas are formed into circular shapes.
15. The spectacle lens according to claim 14 , wherein a diameter of each circular shaped circle is 0.8 to 2.0 mm.
16. The spectacles according to claim 11 , wherein said ametropia comprises myopia.
17. The spectacles according to claim 11 , wherein said first refraction area are formed as the area other than the areas formed as the second refraction areas.
18. The spectacles according to claim 11 , wherein the second refraction areas are formed for having a function of focusing an image on a position other than a retina of the patient.
19. The spectacles according to claim 11 further comprises third refraction areas having the third refractive power which is different from the first refractive power and the second refractive power.