Transparent opthalmic lens having engraved surface indicia

摘要

Indicia are formed in the surface of an ophthalmic contact lens by sublimating lens material with a high intensity beam of radiation. A beam of light from a laser is directed through one or more cooperating masks having openings defining desired indicia. The light which passes through the masks is directed upon a surface of a contact lens, advantageously near the periphery thereof. By selecting a proper wavelength and controlling the amount of energy directed upon the lens surface the depth of sublimation of lens material can be controlled. In this manner symbols can be formed upon the lens for uniquely identifying it.