Patent ID: 6902273

Claim:
A method of designing an ophthalmic lens, comprising the steps of: determining specifications of a temporary lens such that said temporary lens gives an optical power required by a wearer of said ophthalmic lens; applying said temporary lens to a prescribed schematic eye such that said temporary lens is located at a position on said schematic eye corresponding to a stable position on an eye of said wearer in which the ophthalmic lens is held in place; obtaining an optical characteristic of an optical system consisting of said temporary lens and said schematic eye with said temporary lens being located at said stable position on said schematic eye; successively modifying said temporary lens and obtaining successively said optical characteristic corresponding to different configurations of said temporary lens; selecting an optimum one of said different configurations of said temporary lens which gives an optimum one of the successively obtained optical characteristics; and determining specifications of an intended ophthalmic lens as a final product, based on the selected optimum configuration of said temporary lens; wherein said ophthalmic lens is a contact lens; wherein said stable position on an eye of said wearer is determined by an offset amount represented by an angle defined by an intersection of an optical axis of said temporary lens and an optical axis of said schematic eye; wherein said offset amount is determined by averaging a plurality of offset amounts corresponding to different stable positions of a lens on the wearer's eye; and wherein said offset amount does not exceed 30°.