TEMPORARY PHOTOCHROMIC PATCH FOR AN OPHTHALMIC LENS

摘要

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.