Patent ID: 7784937

Claim:
A spherocylindrical lens for use with eyeglasses, the lens having a front surface and a back surface, wherein the back surface comprises: a first portion having a first radius of curvature, wherein the first portion contains an optical center of the back surface of the lens; and a second portion having a second radius of curvature different than the first radius of curvature, wherein the first portion is bounded by the second portion, and the second portion is bounded by a periphery of the back surface of the lens, and wherein the back surface is a surface defined by at least two or more different conic sections, wherein the conic sections excludes a circle, wherein the at least two or more different conic sections pass through an optical center of the lens, wherein the second radius of curvature is continuously changing from the first portion to substantially an edge of the lens, and, wherein the first portion and the second portion are formed from a contiguous piece of lens material using digital surfacing to form the spherocylindrical lens for use with eyeglasses.