Deformable-elastic intraocular lens

Claims

2. The IOL of claim 1 wherein the lens body is formed by chemically crosslinking the diacrylate ester with a partially polymerized mixture of the copolymers, curing the crosslinked acrylic and holding the cured crosslinked acrylic at a temperature below its Beta-relaxation temperature while machining the lens body.

3. The IOL of claim 2 wherein each haptic is attached by forcing an enlarged end thereof into a smaller hole in an edge of the lens body.

5. The IOL of claim 4 wherein the copolymers are mixed and partially polymerized before mixing with the diacrylate ester.

8. The lens body of claim 7 wherein the relatively hard methacrylate ester is a fluoroacrylate.

9. The lens body of claim 7 wherein reaction product comprises ethyl methacrylate, trifluoro ethyl methacrylate and an acrylate ester present in percent by weight concentrations of 25 to 45, 5 to 25 and 30 to 60%, respectively.

10. The lens body of claim 9 wherein the acrylate ester is selected from n-butyl acrylate, ethyl acrylate and 2-ethyl hexyl acrylate.

11. The lens body of claim 10 wherein the diacrylate ester is present in a percent by weight concentration of 0.5 to 3.0%.

12. The lens of body of claim 11 wherein the diacrylate ester is selected from ethylene glycol dimethacrylate, propylene glycol dimethacrylate, and ethylene glycol diacrylate.

13. A method of forming a deformable-elastic intraocular lens body comprising the steps of:

(a) mixing copolymers of methacrylate and acrylate ester which are relatively hard and relatively soft at body temperature;

(b) partially polymerizing the product of Step (a);

(c) chemically crosslinking the product of Step (b) with a diacrylate ester;

(d) curing the product to Step (c); and

(e) forming a lens body having a predetermined optical characteristic from the product of Step (d).

14. The method of claim 13 wherein Step (e) comprises holding the product of Step (d) at a temperature below its Beta-relaxation temperature while machining the lens body.

15. The method of claim 13 wherein the methacrylate and acrylate esters are mixed together in approximately a 45 to 55% by weight ratio.

16. The method of claim 15 wherein the diacrylate ester of Step (C) is present in a percent composition by weight of 0.5 to 3.0%.

17. The method of claim 16 further including the mixing of a UV-absorber and a free radical initiator in Step (a).

18. The method of claim 13 wherein the relatively hard methacrylate ester is a fluoroacrylate.

19. The method of claim 18 wherein Step (a) further including mixing the fluoroacrylate in a concentration range by weight of between 5 and 25% with ethyl methacrylate in a concentration range by weight of between 25 and 45% and an acrylate ester selected from n-butyl acrylate, ethylacrylate or 2-ethyl hexyl acrylate in a concentration range by weight of between 30 and 60%.

20. The method of claim 19 wherein the fluoroacrylate is trifluoro ethyl methacrylate.

21. The method of claim 20 wherein Step (a) further includes the mixing of a UV-absorber in a concentration range by weight of between 0 and 10% and a free radical initiator in a concentration range by weight of 0.05 and 0.2%.