| http://www.w3.org/ns/prov#value | - A contact lens formed from a polysiloxane-urea styrenic macromer of the structure: ##STR17## wherein R1 is a methyl-, phenyl or 3,3,3-trifluoropropyl radical,R2 is a divalent saturated linear or branched hydrocarbon radical of from 1-6 carbon atoms, R3 is a direct bond or has the same definition as R2, R5 is hydrogen or methyl, R6 is the divalent residue of a aliphatic, cycloaliphatic or aromatic
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