Rigid gas permeable contact lens
AssigneeBausch + Lomb Ireland Limited
InventorsSankarsan Biswas, Feng-Yang Shih, James Anthony DiBella, JR., Bonnie J. Burris, Peter J. Tinios, Marianne Yarmey, Kenneth M. Harty, Alok Kumar Awasthi
Life of this patent
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Abstract
A rigid gas permeable contact lens which is a polymerization product of a monomeric mixture including (a) a bulky siloxane monomer or prepolymer having an ethylenically unsaturated reactive group, (b) a non-bulky organosilicon-containing monomer having an ethylenically unsaturated reactive group, (c) a rigid gas permeable contact lens-forming comonomer, and (d) a branched cross-linking agent.
Claims20
A rigid gas permeable contact lens comprising a polymerization product of a monomeric mixture comprising:
- (a) a bulky siloxane monomer or prepolymer having an ethylenically unsaturated reactive group;
- (b) a non-bulky organosilicon-containing monomer having an ethylenically unsaturated reactive group;
- (c) a rigid gas permeable contact lens-forming comonomer;
- and
- (d) a branched cross-linking agent.
A method for making a rigid gas permeable contact lens, comprising:
- (a) curing a monomeric mixture in a mold to form a rigid gas permeable contact lens, the monomeric mixture comprising:
- (i) a bulky siloxane monomer or prepolymer having an ethylenically unsaturated reactive group;
- (ii) a non-bulky organosilicon-containing monomer having an ethylenically unsaturated reactive group;
- (iii) a rigid gas permeable contact lens-forming comonomer;
- and
- (iv) a branched cross-linking agent;
- and
- (b) releasing the rigid gas permeable contact lens from the mold.
A method for making a rigid gas permeable contact lens, comprising:
- (a) curing a monomeric mixture in a mold to form a polymerized rigid gas permeable material, the monomeric mixture comprising:
- (i) a bulky siloxane monomer or prepolymer having an ethylenically unsaturated reactive group,
- (ii) a non-bulky organosilicon-containing monomer having an ethylenically unsaturated reactive group,
- (iii) a rigid gas permeable contact lens-forming comonomer, and
- (iv) a branched cross-linking agent;
- (b) releasing the polymerized rigid gas permeable material in the shape of a rod from the mold;
- (c) transforming the rod into buttons;
- and
- (d) lathing the buttons into a rigid gas permeable contact lens.
Dependencies are inferred from the claim text.