Preparation of stable polyvinyl alcohol hydrogel contact lens

Details Preparation of stable polyvinyl alcohol hydrogel contact lens Preparation of stable polyvinyl alcohol hydrogel contact lens

1990-08-31

1992-12-29

Schofer, Joseph L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonmechanical aftertreatment

523106, 264 11, 264 14, B29D 1100

Patent

active

051749297

ABSTRACT:
A dimensionally stable hydrogel contact lens of polyvinyl alcohol having an equilibrium water content of between about 70 to about 80 weight percent, based upon the total swollen lens weight, said lens having been annealed in a mold essentially conforming to the contact lens dimensions under substantially ambient non-drying setting conditions in the presence of an aqueous-organic annealing promoter solvent, for a period of time substantially sufficient to reach annealing equilibrium.

REFERENCES:
patent: 3408423 (1966-07-01), Friedman
patent: 4469837 (1984-09-01), Cattaneo
patent: 4559186 (1985-12-01), Lee
patent: 4619793 (1986-10-01), Lee
patent: 4874562 (1989-10-01), Hyon
patent: 4966924 (1990-10-01), Hyon et al.

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