Soft contact lens composition and method

Details Soft contact lens composition and method Soft contact lens composition and method

B - Operations, Transporting

29

D

18/106

B29D 11/00 (2006.01)

Patent

CA 1149563

Abstract of the Disclosure A soft contact lens is produced by pouring an excess amount of an original solution for producing a soft contact lens into a concave die; placing a convex die on said concave die and overflowing the excess of said original solution to thereby uniformly fill said original solution in a space between said concave die and said convex die; gelling said original solution between the two dies to form therebetween a lens having a tensile strength of at least about 0.1 kgf/cm2; immersing said lens and said two dies in a liquid to peel said lens from said dies; and extracting the thus-peeled lens via an extraction treatment with water. This process has the advantage of providing a lens which is both optically homogenous and free from bubbles.

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