Abstract: Embodiments of silicone hydrogels, ophthalmic lenses made therefrom, and methods of making the same are described. Fully hydrated silicone hydrogels have relatively high water content and oxygen permeability, along with relatively low modulus of elasticity. Embodiments of the silicone hydrogels in substantially dehydrated condition are adapted to lathe cutting at or above room temperature. Variations of the silicone hydrogels include silicon-containing monomers in an amount of 7.5% or greater by weight, a hydrophilic substituted N-vinyl acetamide monomer, and a hydrophilic non-acetamide monomer in an amount resulting in a hydrophilic substituted N-vinyl acetamide monomer to hydrophilic non-acetamide monomer weight to weight ratio of greater than 2.

Abstract: Embodiments of silicone hydrogels, ophthalmic lenses made therefrom, and methods of making the same are described. Fully hydrated silicone hydrogels have relatively high water content and oxygen permeability, along with relatively low modulus of elasticity. Embodiments of the silicone hydrogels in substantially dehydrated condition are adapted to lathe cutting at or above room temperature. Variations of the silicone hydrogels include silicon-containing monomers in an amount greater than 25% by weight, a hydrophilic substituted N-vinyl acetamide monomer in an amount greater than 30% by weight, and a hydrophilic non-acetamide monomer in an amount resulting in a hydrophilic substituted N-vinyl acetamide monomer to hydrophilic non-acetamide monomer weight to weight ratio of greater than 2.1 to 1.