TEMPORARY PHOTOCHROMIC PATCH FOR AN OPHTALMIC LENS
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
Jul 1, 2011
filing date -
Jul 1, 2011
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Abstract
A process for making a temporary photochromic patch for an ophthalmic lens. A photochromic dye is dissolved in either a siloxane base or curing agent. The base and curing agent are combined to initiate a polymerization reaction that will result in a polydimethylsiloxane (PDMS) polymer matrix having sufficiently low molecular weight to accommodate the photochromic dye's mobility. The polymerization reaction is completed in a form to create a viscoelastic patch. The resulting patch can be trimmed and temporarily applied to an ophthalmic lens without needing adhesive.
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