| http://www.w3.org/ns/prov#value | - The polyurethanic material or resin suitable for use in the lenses of the present invention is preferably an elastomer resin such as those described in the U.S. Pat. No. 5,962,617, U.S. Pat. No. 6,127,505, U.S. 2001/0050356, and U.S. 2001/0028435, each of which are incorporated herein by reference, or similar materials obtained mainly by a procedure called the ???prepolymer method???.
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