Extended wear ophthalmic lens
An ophthalmic lens suited for extended-wear periods of at least one day on the eye without a clinically significant amount of corneal swelling and without substantial wearer discomfort. The lens has a balance of oxygen permeability and ion or water permeability, with the ion or water permeability being sufficient to provide good on-eye movement, such that a good tear exchange occurs between the lens and the eye. A preferred lens is a copolymerization product of a oxyperm macromer and an ionoperm monomer. The invention encompasses extended wear contact lenses, which include a core having oxygen transmission and ion transmission pathways extending from the inner surface to the outer surface.
1. A silicone hydrogel contact lens comprising a core polymeric material formed from polymerizable materials including:
(a) at least one siloxane-containing macromer or monomer; and
(b) at least one hydrophilic monomer,
the contact lens characterized by having on-eye movement with blinking and producing less than about 10% corneal swelling during a period of continuous wear of 7 days including normal sleep periods.
2. The contact lens of claim 1 , wherein the at least one hydrophilic monomer is selected from the group consisting of N,N-dimethylacrylamide, 2-hydroxyethyl methacrylate, N-vinylpyrrolidone, and combinations thereof.
3. The contact lens of claim 1 , wherein the polymerizable materials comprise both the siloxane-containing macromer and the siloxane-containing monomer and N,N-dimethylacrylamide as the at least one hydrophilic monomer.
4. The contact lens of claim 3 , wherein the siloxane-containing macromer is a polydimethylsiloxane macromer.
5. The contact lens of claim 3 , wherein the polymerizable materials comprise a crosslinker.
6. The contact lens of claim 5 , wherein the crosslinker is ethyleneglycol dimethylacrylate.
7. The contact lens of claim 5 , wherein the polymerizable materials comprise a photoinitiator.
8. The contact lens of claim 1 , wherein the contact lens includes a surface that is more hydrophilic than the core polymeric material of the lens.
9. The contact lens of claim 1 , wherein the surface properties of the contact lens are altered by a surface treatment process.
10. The contact lens of claim 9 , wherein the surface treatment is performed prior to and/or posterior to complete polymerization of the polymerizable materials.
11. The contact lens of claim 9 , wherein the surface treatment process comprises a process which causes the polymerizable materials at the surface of the lens to differ from the core.
12. The contact lens of claim 11 , wherein the surface treatment process is selected from the group consisting of a coating process, a grafting process, a plasma treating process, an electric charge treating process, and an irradiation process.
13. The contact lens of claim 1 , wherein the contact lens is characterized by producing less than about 7% corneal swelling during the period of continuous wear.
14. The contact lens of claim 1 , wherein the contact lens is characterized by producing less than about 5% corneal swelling during the period of continuous wear.
15. The contact lens according to claim 5 , wherein the contact lens includes a surface that is more hydrophilic than the core polymeric material of the lens.
16. The contact lens according to claim 5 , wherein the surface properties of the contact lens are altered by a surface treatment process.
17. The contact lens of claim 16 , wherein the surface treatment is performed prior to and/or posterior to complete polymerization of the polymerizable materials.
18. The contact lens of claim 16 , wherein the surface treatment process comprises a process which causes the polymerizable materials at the surface of the lens to differ from the core.
19. The contact lens of claim 18 , wherein the surface treatment is selected from the group consisting of a coating process, a grafting process, a plasma treating process, an electric charge treating process, and an irradiation process.
20. The contact lens of claim 5 , wherein the contact lens is characterized by producing less than about 7% corneal swelling during the period of continuous wear.
21. The contact lens of claim 5 , wherein the contact lens is characterized by producing less than about 5% corneal swelling during the period of continuous wear.