Patent ID: 8002404

Claim:
A prescription lens fitted for an eyeglass frame, the lens having: (a) a spherical front lens surface with a front base curve configured to match a curve profile of the frame; and (b) a rear lens surface curved such that the lens has a central optical zone, an annular intermediate zone surrounding the central optical zone, and an annular edge zone surrounding the intermediate zone; wherein the rear lens surface in the central optical zone has a curvature such that the central optical zone of the lens has a lens power substantially equal to a prescription for a wearer of the lens, the rear lens surface in the edge zone has a substantially flat profile in a direction substantially perpendicular to an optical axis of the prescription lens, and the rear lens surface in the intermediate zone has a curvature that smoothly bridges the curvature of the rear lens surface in the central optical zone and the flat profile of the rear lens surface in the edge zone.