Annealed polyvinyl alcohol contact lens

Details Annealed polyvinyl alcohol contact lens Annealed polyvinyl alcohol contact lens

B - Operations, Transporting

29

D

18/106

B29D 11/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1222357

ANNEALED POLYVINYL ALCOHOL CONTACT LENS Abstract of the Disclosure Optically clear soft contact lenses of aqueous swollen solid polyvinyl alcohol having a weight average molecular weight of at least 6,000, having been annealed under crystallinity promoting conditions to effectively increase the elastic modulus of the swollen lenses, and optionally subsequently crosslinked, and methods of preparation and the use thereof are disclosed. The lenses are characterized by their relatively high oxygen trans- missibility, sufficient to meet the needs of the human cornea, high optical clarity, improved hot water resistance and superior mechanical properties.

426833

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