Patent ID: 6994435
Filing Date: 2006-02-07
Classification: G02B,G02C

Abstract:
1. A spectacle lens having an outer surface and an inner surface, one of the outer and inner surfaces being configured to be a rotationally-asymmetrical aspherical surface, when a curvature at a coordinate (h,θ) of the outer surface is represented by C 1 (h,θ), a curvature at a coordinate (h,θ) of the inner surface is represented by C 2 (h,θ), and a difference between curvatures of the outer surface and the inner surface at the coordinate (h,θ) is represented by C 2-1 (h,θ)=C 2 (h,θ)−C 1 (h,θ), if C 2-1 (0,θ)>0, said spectacle lens satisfying a condition (1): and if C 2-1 (0,θ)<0, said spectacle lens satisfying a condition (2): wherein the conditions (1) and (2) hold within ranges of 10 mm≦h≦20 mm and 30°≦θ≦150°, wherein given that a normal line which is normal to the outer surface through a centration point is regarded as a z wherein given that a normal line which is normal to the inner surface through the centration point is regarded as a z wherein the centration point being defined as a point which coincides with a pupil position of a wearer when said spectacle lens is viewed from a front side in a state of wearing of said spectacle lens.