Eyeglass lens
The present invention provides an eyeglass lens and its related techniques, the eyeglass lens including: a base region that causes a light flux that has entered from an object-side face to exit from an eyeball-side face, and to enter an eye and converge at a position A on a retina; and a plurality of defocus regions that are in contact with the base region, in which a light flux that passes through at least part of each defocus region is incident on the position A as diverging light, wherein a refractive power in the defocus regions increases in a direction from a center portion to a peripheral portion.
1. An eyeglass lens comprising:
a base region that causes a light flux that has entered from an object-side face to exit from an eyeball-side face, and to enter an eye and converge at a position A on a retina; and
a plurality of convex regions that are in contact with the base region and that project from the base region, in which the light flux that passes through at least part of each defocus region is incident on the position A as diverging light,
wherein, in at least the part of each of the convex regions,
a refractive power in a center portion is the same as a refractive power in the base region, and
the refractive power increases in a peripheral portion in a direction from the center portion to the peripheral portion.
2. The eyeglass lens according to claim 1 , wherein light that passes through each of the convex regions and exits from the eyeglass lens is in the same state as light that passes through a virtual lens with positive spherical aberration added to a spherical lens with a focal length equivalent to the center portion of the convex region.
3. The eyeglass lens according to claim 1 , wherein a light spot that is incident on the position A as diverging light is such that the highest light intensity density, at a position that is closer to an object than the position A is, is higher than that at the position A.
4. The eyeglass lens according to claim 1 , wherein the eyeglass lens is a myopia progression suppressing lens.
5. The eyeglass lens according to claim 2 , wherein the eyeglass lens is a myopia progression suppressing lens.
6. The eyeglass lens according to claim 3 , wherein the eyeglass lens is a myopia progression suppressing lens.
7. The eyeglass lens according to claim 1 , wherein the refractive power increases monotonically in the direction from the center portion to the peripheral portion.
8. The eyeglass lens according to claim 1 , wherein an amount the refractive power increases is 1.0 to 8.0 D.
9. The eyeglass lens according to claim 1 wherein each of the convex regions is formed as a curved face.
10. The eyeglass lens according to claim 1 , wherein a diameter of each of the convex regions in a plan view is 0.6 to 2.0 mm and a diameter of the center portion of each convex region in a plan view is at least 0.2 mm.