Method for adding a thermoset overmold layer to a lens within a mold
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United States of America Patent
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Oct 26, 2010
Issued Date -
N/A
app pub date -
Jun 20, 2007
filing date -
Jun 20, 2007
priority date (Note) -
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Abstract
A method and coating used to prepare a photochromically-enabled bifocal ophthalmic lens. The method and equipment includes injection molding a single vision lens, for example, from polycarbonate. The clamp opens vertically and the top insert is exchanged for a bifocal mold having a base curve similar to the single vision lens. The thermoset coating includes compounds from several acrylate classes, and is applied to the single vision lens. The coating may include a photochromic dye. The coating is also formulated to receive a photochromic solution through an imbibition process.
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