Colored soft contact lens and method and apparatus for forming

Details Colored soft contact lens and method and apparatus for forming Colored soft contact lens and method and apparatus for forming

G - Physics

02

C

88/39, 88/40

G02C 7/04 (2006.01)

Patent

CA 1137342

ABSTRACT OF THE DISCLOSURE A method for forming a colored image in a limited area of a vision- corrective soft contact lens. In one method, the lens is soaked in a diszonium salt and then exposed to actinic light through a mask which transmits light only to the non-imagc area of the lens. Then, the unexposed image area is deve-loped by contact with an azo coupler. In a second method, the diazonium salt issoaked in a gel relief of the desired image configuration and contacted with the lens. The image is developed by soaking in the azo coupler. In a third method, the diazonium salt, azo coupler, and a coupling inhibitor (a pH reducingagent) are premixed and applied by the gel relief. The image is then developed by raising the image pH level as by contact with ammonia gas. Also, apparatus for precisely contacting the lens with the gel relief image.

368068

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