Patent ID: 6126285
Filing Date: 2000-10-03
Classification: G02C

Abstract:
A contact lens type trial lens to be temporarily worn by a wearer for fitting the wearer with a contact lens by determining a relative position of an optical center of the contact lens with respect to a geometric center of the contact lens, wherein the contact lens has a lens surface in an optical area formed so as to include any one of a plurality of spherical surfaces and a toric surface, said trial lens comprising:a lens surface in a central portion of said trial lens, wherein said lens surface substantially corresponds to the optical area of the contact lens; andan index any one of formed in and on said lens surface at said central portion so as to be permanent and non-removable, wherein said index provides a reference to identify a certain point on said lens surface of said central portion of said trial lens for fitting the wearer with the contact lens which is optimal according to values measured using said index of said trial lens.