USING HIGHER ORDER MATHEMATICAL FUNCTIONS TO CREATE ASYMMETRIC MOLDING BACK PIECES

摘要

This invention is related to creation of a mold for an ophthalmic lens using higher order mathematical functions, such as non-uniform rational b splines (NURBs), to create surfaces that do not contact fluid optical material, such as molding back pieces. In particular, the present invention optimizes the flow of mold material. Additionally, use of the present invention creates substantially uniform thickness of the mold, minimizing optical distortions.