Photochromic contact lenses and methods for their production

Details Photochromic contact lenses and methods for their production Photochromic contact lenses and methods for their production

G - Physics

02

B

G02B 1/04 (2006.01) B29D 11/00 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2603510

A photochromic composition for use in tinting contact lenses in which the binding polymer used is capable of forming an interpenetrating polymer network with the lens material. When the photochromic compositions of the invention are applied to uncured lens material that is subsequently cured, the binding polymer forms an interpenetrating polymer network with the lens material embedding the photochromic compound within the lens material resulting in a stable, photochromic lens.

La présente invention concerne une composition photochromique conçue pour être utilisée dans les lentilles de contact de coloration dans laquelle le polymère liant utilisé est capable de former un réseau polymère interpénétrant avec le matériau de lentille. Lorsque les compositions photochromiques de l~invention sont appliquées au matériau de lentille non durcie et ensuite durcie, le polymère liant forme un réseau polymère interpénétrant avec le matériau de lentille incorporant le composé photochromique à l~intérieur du matériau de lentille pour produire une lentille photochromique stable.

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