Wettable, rigid gas permeable, substantially non-swellable contact lens

Abstract From the Canadian patent

This invention relates to ophthalmic devices such as contact lenses and, intraocular implants and particularly contact lenses of a block copolymer containing polysiloxane and polyoxyalkylene oxide units possessing an advantageous blend of desirable properties including a) high oxygen permeability, b) good wettability, c) optical clarity and d) a substantially lack of aqueous swellability in the ocular environment of use. Even the preparation thereof and methods of treating vision defects therewith are disclosed as well as the polymers suitable for these ophthalmic devices.