Gas permeable contact lens and method and materials for its manufacture
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United States of America Patent
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-
Mar 14, 1989
Grant Date -
N/A
app pub date -
Jun 18, 1987
filing date -
Jun 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A polymer is prepared by forming a mixture of 3-methacryloxypropytris(trimethylsiloxy) silane, methacrylic acid, cyclohexylmethacrylate, 2-hydroxypropylmethacrylate, m,p-styrylethyltrimethoxysilane, methyl methacrylate and a cross linker. A polymerization initiator is added to the mixture, and UV or thermal energy is supplied so that the mixture polymerizes to form a polymer that is transparent, hard, machinable and oxygen permeable. The polymer is cut into lenses, and the lenses are treated with acetyl chloride or another suitable chemical so that their surfaces become hydrophilic. The result is oxygen-permeable, hydrophilic, daily and extended-wear, hard contact lenses.
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