Method of making a contact lens material which may be identified by colored fluorescence
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United States of America Patent
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-
Sep 22, 1987
Issued Date -
N/A
app pub date -
Sep 30, 1986
filing date -
Apr 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making contact lens materials which are identifiable from similar contact lens materials. This is done by selecting a fluorescent colored soluble organic fluorescent dye in solid state solution in a transparent organic resin. The fluorescent color pigment is added in small amounts ranging from 0.0003 to 0.009 parts by weight of the lens monomer mixture. The lens monomer mixture containing the fluorescent dye is polymerized to form a solid contact blank. A contact lens is made from the solid polymerized blank containing the colored fluorescent dye. The contact lens convex surface is placed on a dark flat surface. In the absence of visible light the lens is irradiated with ultraviolet light. The colored fluorescent light emanating from the dye within the lens is concentrated at the lens edge by reflecting between the lens polished optical surfaces. The colored fluorescent light exits the lens at the edge. The lens material is identified by observing the color visible at the lens edge.
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