Patent ID: 8777407
Filing Date: 2014-07-15
Classification: G02C

Abstract:
1. A progressive-power lens comprising: an eyeball-side surface including a distance portion and a near portion having different values of dioptric power and an intermediate portion that connects the distance portion and the near portion to each other; and an object-side surface including a first region extending along a principal meridian and having a Spherical shape having a first curvature, a second region corresponding to the distance portion and having a spherical shape having a second curvature equal to the first curvature, and a third region located outside the first region and below the second region and having a third curvature greater than the first and second curvatures, wherein the first curvature of the first region, the second curvature of the second region, and the third curvature of the third region form a set of curvatures common to spectacle specifications having any addition dioptric power range falling within addition dioptric powers of 0.5(D) to 3.5(D).