High water content silicone hydrogels

A contact lens made from a polymerization product of a monomer mixture comprising (a) a major amount of a non-silicone-containing hydrophilic monomer;

• and (b) a minor amount of a silicone-containing monomer, wherein the contact lens is composed of a silicone hydrogel that has a water content of greater than 50 weight percent.

A silicone hydrogel formed from a hydrated polymerization product of a monomer mixture comprising (a) greater than about 65 weight percent of a non-silicone-containing hydrophilic monomer;

• and (b) less than about 15 weight percent of a silicone-containing monomer, wherein the silicone hydrogel has a water content of greater than 50 weight percent, an advancing contact angle of no more than about 100 degrees and an oxygen permeability of about 30 to about 70 Barrers.

A silicone hydrogel formed from a hydrated polymerization product of a monomer mixture comprising about 90 weight percent N-vinyl-2-pyrrolidone, about 5 to 10 weight percent 4-t-butyl-2-hydroxycyclohexyl methacrylate, about 0.20 to 0.38 weight percent allyl methacrylate, about 0.20 to 0.38 weight percent ethyleneglycol dimethacrylate, about 5 weight percent silicone containing monomer and about 0.5 weight percent azo bis-isobutylnitrile;

• wherein the silicone hydrogel has a water content of greater than 50 weight percent.