Method of making a contact lens material which may be identified

摘要

A method of making contact lens materials which are identifiable from similar contact lens materials. This is done by selecting a fluorescent colored pigment comprised of an organic fluorescent dye in solid state solution in a transparent amorphous organic resin particle. The fluorescent color pigment is added in small amounts ranging from 0.0003 to 0.009 parts by weight of the lens monomer mixture. The lens monomer mixture containing the fluorescent color is polymerized to form a solid contact blank. A contact lens is made from the solid polymerized blank containing the colored fluorescent pigment. The contact lens convex surface is placed on a dark flat surface. In the absence of visible light the lens is irradiated with ultraviolet light. The colored fluorescent light emanating from the pigment within the lens is concentrated at the lens edge by reflecting between the lens polished optical surfaces. The colored fluorescent light exits the lens at the edge. The lens material is identified by observing the color visible at the lens edge.