Monomer, polymers, and ophthalmic lenses and contact lenses made by using the same

摘要

A monomer as represented by general formula (a) or (a') below, with which a polymer having high oxygen permeability and transparency and suited to an ophthalmic lens is obtained, is provided. Suitable monomers include: wherein A is a siloxanyl group; R<1 >is H or a methyl group; R<2 >is a substituted group that is selected from the group consisting of alkyl groups with 1 to 20 carbon atoms that may be substituted, aryl groups with 6 to 20 carbon atoms that may be substituted and formula (c) below.