Contact lens

Patent metadata

Field	Value
Publication number	US-9869884-B2
Application number	US-201514948683-A
Country	US
Kind code	B2
Filing date	Nov 23, 2015
Priority date	Nov 22, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A contact lens constructed to limit the water transmissibility of at least one area of the lens while maintaining at least a minimum oxygen transmissibility. The water transmissibility maximum and oxygen permeability minimum are achieved by a predetermined lens thickness of a single lens material or by the use of two or more material layers.

First claim

That which is claimed:

1. A composite film comprising a primary material film and a secondary material film,
where the composite film has a thickness, a permeability for oxygen, and a permeability for water;
where the primary material film and secondary material film each has a thickness, a permeability for oxygen, and a permeability for water;
where the thickness of the composite comprises the summed thicknesses of the primary material film and secondary material film, where the thickness of the primary material film and the thickness of the secondary material film are such that the difference between the permeability for oxygen of the composite film and the permeability for oxygen of the primary material film is less than the difference between the permeability for water of the composite film and the permeability for water of the primary material film.

2. The composite film of claim 1 , wherein the thickness of the secondary material film is less than the thickness of the primary material film.

3. The composite film of claim 1 , wherein an oxygen permeant ratio is the ratio of the permeability for oxygen of the primary material film to the permeability for oxygen of the secondary material film, wherein a water permeant ratio is the ratio of the permeability for water of the primary material film to the permeability for water of the secondary material film, where the water permeant ratio is larger than the oxygen permeant ratio.

4. The composite film of claim 3 , wherein the water permeant ratio is 10 or larger and the oxygen permeant ratio is 5 or smaller.

5. The composite film of claim 3 , wherein the water permeant ratio is 20 or larger and the oxygen permeant ratio is 3 or smaller.

6. The composite film of claim 3 , wherein the water permeant ratio is 30 or larger and the oxygen permeant ratio is 2 or smaller.

7. The composite film of claim 1 , where the permeability for oxygen of the composite film is no less than ninety-five percent of the permeability for oxygen of the primary material film.

8. The composite film of claim 1 , where the permeability for oxygen of the composite film is no less than ninety percent of the permeability for oxygen of the primary material film.

9. The composite film of claim 1 , where the permeability for oxygen of the composite film is no less than seventy-five percent of the permeability for oxygen of the primary material film.

10. The composite film of claim 1 , where the permeability for oxygen of the composite film is no less than fifty percent of the permeability for oxygen of the primary material film.

11. The composite film of claim 1 , where the permeability for water of the composite film is no more than twenty-five percent of the permeability for water of the primary material film.

12. The composite film of claim 1 , where the permeability for water of the composite film is no more than fifty percent of the permeability for water of the primary material film.

13. The composite film of claim 1 , where the permeability for water of the composite film is no more than seventy-five percent of the permeability for water of the primary material film.

14. The composite film of claim 1 , where the permeability for water of the composite film is no more than ninety percent of the permeability for water of the primary material film.

15. The composite film of claim 1 , where the permeability for water of the composite film is no more than ninety-five percent of the permeability for water of the primary material film.

16. The composite film of claim 1 , wherein the water is water vapor.

17. The composite film of claim 1 , wherein the primary material film is a polymer containing cross-linked polydimethylsiloxane.

18. The composite film of claim 1 , wherein the primary material film is a polymer containing silicone acrylate.

19. The composite film of claim 1 , wherein the secondary material film is an amorphous or crystalline fluorocarbon containing film.

20. The composite film of claim 1 , wherein the secondary material film is a polyurethane containing film.

21. The composite film of claim 1 , wherein the secondary material film is a silicone containing film.

22. The composite film of claim 1 , wherein the primary material film and the secondary material film each have a modulus, wherein the modulus of the primary material film is greater than the modulus of the secondary material film.

23. The composite film of claim 1 , wherein the primary material film and the secondary material film each have a modulus, wherein the modulus of the primary material film is less than the modulus of the secondary material film.

24. A contact lens comprising a composite film,
where the composite film comprises a layered primary material film and a layered secondary material film, where the composite film has a thickness, a permeability for oxygen, and a permeability for water;
where the primary material film and secondary material film each have a thickness, a permeability for oxygen, and a permeability for water;
where the thickness of the composite comprises the summed thicknesses of the primary material film and secondary material film, where the thickness of the primary material film and the thickness of the secondary material film are such that the difference between the permeability for oxygen of the composite film and the permeability for oxygen of the primary material film is less than the difference between the permeability for water of the composite film and the permeability of water of the primary material film.

25. The contact lens of claim 24 , where the contact lens has an average thickness of greater than 0.4 millimeters.

26. The contact lens of claim 24 , where the contact lens has an average thickness of greater than 0.3 millimeters.

27. The contact lens of claim 24 , where the contact lens has an average thickness of greater than 0.2 millimeters.

28. The contact lens of claim 24 , wherein the contact lens is a soft contact lens.

29. The contact lens of claim 24 , wherein the contact lens is a rigid contact lens.

30. The contact lens of claim 24 , wherein the water is water vapor.

31. The contact lens of claim 24 , wherein the primary material film is a polymer containing cross-linked polydimethylsiloxane.

Assignees

• Innovega Inc

Inventors

• Meyers William E
• Legerton Jerome A
• Marsh Jay P

Classifications

• G02B1/043

  Contact lenses · CPC title

• B32B2307/724

  Permeability to gases, adsorption · CPC title

• B29C39/00

  Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor (B29C41/00 takes precedence) · CPC title

• B32B27/322

  comprising halogenated polyolefins, e.g. PTFE · CPC title

• B32B2551/00

  Optical elements · CPC title