Contact lens with a hydrophilic layer
Embodiments of the technology relate to a contact lens having a core that is coated by a hydrogel layer, and to methods of making such a lens. The coated lens can include a rigid gas permeable contact lens. The coated lens can also include a hybrid silicone and rigid gas permeable contact lens. In one aspect, embodiments provide for a coated contact lens comprising a lens core with a water equilibrium constant of less than about 2% comprising an outer surface; and a hydrogel layer covalently attached to at least a portion of the outer surface, the hydrogel layer adapted to contact an ophthalmic surface, wherein the hydrogel layer comprises a hydrophilic polymer population of one or more species.
1. A multi-layer contact lens comprising a lens core layer covered by an outer hydrophilic polymer layer, wherein the hydrophilic polymer layer is attached to the core layer by a covalent linkage, wherein the hydrophilic polymer layer comprises a first macromer subpopulation comprising polyethylene glycol (PEG) and a second macromer subpopulation comprising polyacrylamide, wherein the first macromer subpopulation and second macromer subpopulations are at least partially covalently cross-linked, wherein the hydrophilic polymer layer has a thickness of less than about 50 nm.
2. The lens of claim 1 , wherein the core comprises a hydrogel.
3. The lens of claim 1 , wherein the core comprises a silicone hydrogel.
4. The lens of claim 1 , wherein the lens core layer comprises a rigid gas permeable lens material.
5. The lens of claim 1 , wherein the first macromer subpopulation comprises a moiety at a first portion that forms a covalent attachment to the outer surface of the lens core layer; and the second macromer subpopulation comprises a second moiety that forms a covalent bond to a second portion of the first macromer subpopulation.
6. The lens of claim 5 , wherein the core comprises a hydrogel.
7. The lens of claim 5 , wherein the core comprises a silicone hydrogel.
8. The lens of claim 5 , wherein the lens core layer comprises a rigid gas permeable lens material.
9. The lens of claim 1 wherein the lens core layer comprises a bifunctional monomer or polymer covalently bound to the lens core layer and the outer hydrophilic polymer layer.
10. The lens of claim 9 , wherein the lens core layer comprises a hydrogel.
11. The lens of claim 9 , wherein the lens core layer comprises a silicone hydrogel.
12. The lens of claim 9 , wherein the lens core layer comprises a rigid gas permeable lens material.