Corneal contact lens and method of making the same

摘要

An improved transparent corneal contact lens and method of making the same is disclosed. The lens has an outer edge portion of about 0.7 mm effective radius and a thickness of between about 0.003 to about 0.004 inches. The apex of the outer edge is positioned to be at or below the center line between the posterior and anterior surfaces of the outer edge portion to enable lacrimal fluid to flow between the lens and the corneal surface as well as substantially reduce the possibility of collision by the upper lid during closing. The method involves slowly heating, maintaining and cooling the lens and thereafter cutting the lens within a specified time after it has reached ambient temperature, which enables the lens to be more thinly cut.