Method of producing annealed polyvinyl alcohol contact lens
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United States of America Patent
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-
Oct 28, 1986
Issued Date -
N/A
app pub date -
Jul 26, 1984
filing date -
Apr 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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 transmissibility, sufficient to meet the needs of the human cornea, high optical clarity, improved hot water resistance and superior mechanical properties.
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