Ultraviolet light absorbing ocular lens
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United States of America Patent
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Sep 15, 1992
Grant Date -
N/A
app pub date -
Nov 26, 1991
filing date -
Nov 26, 1990
priority date (Note) -
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Abstract
An ultraviolet light absorbing occular lens comprising a vinyl type copolymer containing from 0.01 to 0.5% by weight of a benzotriazole type ultraviolet light absorbing monomer as chemically bonded therewith, the ultravioleet light absorbing monomer having the formula: ##STR1## (wherein R.sub.1 is H or CH.sub.3 and n is 2 or 3).
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