Composite ophthalmic lens and method for obtaining same

• US 6,709,107 B2
• Filed: 10/29/2001
• Issued: 03/23/2004
• Est. Priority Date: 04/29/1999
• Status: Expired due to Term

• Current Assignee: Essilor International Compagnie Generale D Optique (Essilor International SA)
• Original Assignee: Essilor International Compagnie Generale D Optique (Essilor International SA)
• Inventors: Jiang, Peiqi, Menduni, Gilbert, Cabeza, Stéphane
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): Ribar, Travis B
• Application Number:
  US10/037,802
• Publication Number:
  US 20020164484A1
• Time in Patent Office: 876 Days
• Field of Search: 428/412, 428/423.1, 428/704, 351/44, 351/159, 351/160, 351/161, 351/163, 351/164, 351/166, 351/167, 351/168, 351/169, 351/176
• US Class Current: 351/176
• CPC Class Codes: G02C 7/02 Lenses; Lens systems ; Methods of designing lenses
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

The composite ophthalmic lens (1) comprises a first layer (2), at least 200 micrometers thick, forming a front part of said lens, of a first polymeric material of refractive index higher than or equal to 1.60 and having a front face (4) constituting a front optical surface S1, and a second layer (3), at least 200 micrometers thick, of a second polymeric material forming a rear part of said lens and having a rear face (6) constituting a rear optical surface S2, the interface (5) between these two layers constituting an optical surface S3 parallel to the rear optical surface S2.

Claims

1. A composite ophthalmic lens comprising a first layer and a second adjacent layer defining between them an interface wherein:

the first layer forms a front part of the lens, is at least 200 micrometers thick, is comprised of a first polymeric material of refractive index higher than or equal to 1.60, and comprises a front face constituting a front optical surface S1;

the second layer forms a rear part of said lens, is at least 200 micrometers thick, is comprised of a second polymeric material, and comprises a rear face constituting a rear optical surface S2; and

the interface is further defined as an optical surface S3, which is parallel to the rear face of the second layer.

2. The ophthalmic lens of claim 1, wherein the second polymeric material has a refractive index lower than the first polymeric material.

3. The method of claim 2, wherein the difference between the refractive indices of the first and second materials is at least 0.05.

4. The method of claim 3, wherein the difference between the refractive indices of the first and second materials is at least 0.10.

5. The ophthalmic lens of claim 1, wherein the front optical surface S1 is a multifocal optical surface.

6. The ophthalmic lens of claim 1, wherein the front optical surface S1 is a progressive optical surface.

7. The ophthalmic lens of claim 1, wherein the rear optical surface S2 is a spherical optical surface.

8. The ophthalmic lens of claim 1, wherein the rear optical surface S2 is a toric optical surface.

9. The ophthalmic lens of claim 1, wherein the first layer has a center thickness of 0.2 to 10 mm.

10. The ophthalmic lens of claim 1, wherein the second layer has a center thickness of 0.2 to 1 mm.

11. The ophthalmic lens of claim 1, wherein the refractive index of the first polymeric material is higher than or equal to 1.65.

12. The ophthalmic lens of claim 11, wherein the refractive index of the first polymeric material is higher than or equal to 1.67.

13. The ophthalmic lens of claim 12, wherein the refractive index of the first polymeric material is higher than or equal to 1.7.

14. The ophthalmic lens of claim 1, wherein the first polymeric material comprises a material containing sulphur.

15. The ophthalmic lens of claim 14, wherein the first polymeric material comprises a polythiourethane or episulfide polymer.

16. The ophthalmic lens of claim 1, wherein the second polymeric material comprises a poly (allyl carbonate), a polyurethane, a polythiourethane, and/or a polycarbonate.

17. The ophthalmic lens of claim 1, further defined as comprising an anti-abrasion coating deposited on at least one of the front face and the rear face.

18. The ophthalmic lens of claim 17, further defined as comprising an anti-dazzle coating deposited on the anti-abrasion coating.

19. The ophthalmic lens of claim 17, further defined as comprising an adhesive primer between at least one of the front face and the rear face and the anti-abrasion coating deposited on at least one of the front face and the rear face.

20. The ophthalmic lens of claim 1, wherein the second layer is a preform comprising a front face on which the first layer of the first polymeric material has been hardened.