Photochromic contact lens having excellent discoloring...

Details Photochromic contact lens having excellent discoloring... Photochromic contact lens having excellent discoloring...

2007-08-28

2007-08-28

Gulakowski, Randy (Department: 1712)

Compositions

Light transmission modifying compositions

Displaying color change

C252S582000, C351S16000R, C351S162000, C523S106000, C523S107000, C544S071000

Reexamination Certificate

active

11175888

ABSTRACT:
A photochromic contact lens having a period of time for discoloring the contact lens from a colored state to the uncolored state shortened, wherein the photochromic contact lens is made of an oxygen-permeable polymer material having a second-order transition point of not higher than 110° C., and formed to have an oxygen permeation coefficient of not less than 50, and wherein the contact lens contains a dye capable of exhibiting photochromism.

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patent: 04-208919 (1992-07-01), None
patent: 2723225 (1997-11-01), None

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