Patent ID: 8641192

Claim:
A system for manufacturing a positive power lens for use in prescription eyeglasses, comprising: a surfacing component configured to apply a new back surface to a lens blank, wherein the lens blank has a front surface and a back surface, and the front surface has a front surface radius of curvature associated with a prescription for a lens having positive power; and a processor, communicatively coupled to the surfacing component, and configured to: determine when a back surface radius of curvature is applied to the back surface of the lens blank, such that the back surface radius of curvature together with the front surface radius of curvature provide the prescription, whether a first thickness of a peripheral section of the lens blank will be less than a predetermined thickness threshold; and if the determination is that the first thickness of the peripheral section of the lens blank with the back surface radius of curvature will be less than the predetermined thickness threshold, then directing the surfacing component to remove less than the lens blank material needed to create the back surface radius of curvature from the peripheral section of the back surface, wherein a resulting peripheral section has a second thickness equal to or greater than the predetermined thickness threshold, and a resulting optical power of the resulting peripheral section differs from the prescription.