Method of increasing the concentration of radiation-absorbing agents in optical and ophthalmic lenses
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United States of America Patent
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Jan 2, 1996
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N/A
app pub date -
May 20, 1994
filing date -
May 20, 1994
priority date (Note) -
Expired
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Abstract
A method and composition useful in fabricating radiation-absorbing contact lenses, especially ultraviolet (UV) and visible (tint) light-absorbing lenses. The radiation-absorber is incorporated into a contact lens in the presence of a buffer which maintains the pH near neutral. Subsequently, the radiation-absorber is chemically affixed to the lens by raising the pH to a highly basic level.
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