| http://www.w3.org/ns/prov#value | - wn by the general formula II can be used for a contact lens of the present invention: [0110] wherein, R1 is hydrogen or methyl group; each of R2, R3, R4 and R5 is a hydrocarbon group with 1-12 carbon atoms or trimethylsiloxy group; Y consists of the structural units (I???) and (II???) shown below, ratio of the structural unit (I???) and the structural unit (II???) being 1:10-10:1 and total number
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