monomeric polysiloxanes end - capped with activated unsaturated groups and polymers and copolymers thereof are disclosed herein for use as contact lenses with improved properties , such as , oxygen transportability , hydrolytic stability , biological inertness , transparency and improved strength without the use of fillers . the polymer composition comprises a poly α , ω terminally bonded through a divalent hydrocarbon group to a polymerized activated unsaturated group . contact lenses made therefrom can be , as commonly referred to , &# 34 ; hard &# 34 ; or &# 34 ; soft &# 34 ;. this hardness or softness is a function of the comonomer or the molecular weight of the monomers . preferable the contact lenses are &# 34 ; soft &# 34 ;. the copolymer compositions of the instant invention comprise the polymerization product of the polysiloxane monomers and monomer or monomers containing an activated vinyl group . these polymers are employed to make optical products , e . g . contact lenses , intraocular implants , etc .