Method of making photoprotective hydrophilic polymers and ocular devices thereof
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
Dec 7, 1989
filing date -
Dec 7, 1989
priority date (Note) -
Expired
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Abstract
A method of making pigmented hydrophilic polymers in such a manner that the resulting polymers absorb ultraviolet and visible radiation, and that no migration, separation or leaching of the pigment can take place, is disclosed. The polymer compositions comprise blends of hydrophilic polymers with melanin pigments, the latter being synthesized on the hydrophilic polymer matrix. The disclosed polymer compositions are useful in the manufacture of ocular devices, particularly intraocular lenses and aphakic contact lenses capable of absorbing ultraviolet and visible radiation, at wavelengths between 300 and 700 nanometers, to the same extent as the natural crystalline lens of the eye. The disclosed method is also useful to impart photoprotective properties to the already made said ocular devices.
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