A thin IOL capable of insertion through a small incision into the capsular bag of an eye includes haptics having free ends configured to absorb compressive forces resulting from shrinkage of the capsular bag in the weeks following surgery.
1. A foldable IOL for placement in an evacuated capsular bag of an eye, said IOL comprising:
a) an optic having opposite anterior and posterior surfaces defining a geometric center and a periphery, the posterior surface of the optic having a sharp barrier edge for the prevention of PCO;
b) at least two haptics extending from said periphery, each of said haptics having an elongated section and terminating in a free end that is angled in an anterior direction with respect to said elongated section;
whereby when implanted in the evacuated capsular bag of an eye with said geometric axis generally aligned along the optical axis of the eye, the free ends of said haptics will each flex in a respective plane that extends generally perpendicular to the plane in which optic lies in response to a radial compressive force applied thereto while said optic geometric center axis remains generally aligned with said optical axis.
2. The IOL of claim 1 wherein said elongated section of each said haptic extends substantially straight when in an unstressed condition.
3. The IOL of claim 2 wherein said free end of each haptic extends at an angle of between about 10° and 50° relative to said elongated section of a respective free end.
4. The IOL of claim 2 wherein said free end of each haptic extends at an angle of between about 20° and 40° relative to said elongated section of a respective free end.
5. The IOL of claim 2 wherein said free end of each haptic extends at an angle of about 33° relative to said elongated section of a respective free end.
6. The IOL of claim 2 wherein each said haptic has a distal length adjacent said free end thereof and a proximal length adjacent said optic periphery, and wherein said distal length is thinner than said proximal length.
7. The IOL of claim 1 wherein each free end comprises at least two spaced fingers lying in a common plane which extends generally perpendicular to the axis of said optic geometric center, said at least two spaced fingers being movable toward one another in response to a compressive force applied thereto.
8. The IOL of claim 7 wherein each of said free ends include a beveled tip.
9. The IOL of claim 8 wherein said beveled tip has a bevel angle of about 10° to 20°.
10. The IOL of claim 8 wherein said beveled tip has a bevel angle of about 18°.
11. The IOL of claim 1 wherein said haptics each have a maximum thickness of about 0.2 mm.
12. The IOL of claim 1 wherein said lens is made from acrylic.
13. The IOL of claim 1 wherein each of said free ends include a beveled tip.
14. The IOL of claim 13 wherein said beveled tip has a bevel angle of about 10° to 20°.
15. The IOL of claim 13 wherein said beveled tip has a bevel angle of about 18°.
16. A foldable IOL comprising:
a) an optic having opposite anterior and posterior surfaces having a geometric center axis and a periphery the posterior surface of the optic having a sharp barrier edge for the prevention of PCO;
b) at least two haptics extending from said periphery, each of said haptics having an elongated section and terminating in a free end that is angled in an anterior direction with respect to said elongated section, each of said free ends comprising at least two fingers, the fingers being spaced apart from one another.
17. The IOL of claim 16 wherein the free ends extend in an anterior direction relative to a respective elongated section.
18. The IOL of claim 16 wherein for each of the free ends the at least two fingers extend substantially parallel to each other, and wherein each finger on all of the free ends comprises a tip and all of the tips lie in a plane which is generally perpendicular to the geometric center axis of said optic.
19. The IOL of claim 17 wherein each said free end extends at an angle of between about 10° and 50° relative to said elongated section of said free end.
20. The IOL of claim 17 wherein said free end of each haptic extends at an angle of between about 20° and 40° relative to said elongated section of a respective free end.
21. The IOL of claim 17 wherein said free end of each haptic extends at an angle of about 33° with respect to said elongated section of a respective free end.
22. The IOL of claim 17 wherein said free end of each haptic comprises about 25% of the length of a respective elongated section.
23. The IOL of claim 17 wherein said lens is flexibly movable between a first, unstressed configuration and a second, stressed configuration.
24. The IOL of claim 23 wherein when said lens is in said unstressed configuration, said elongated sections of said haptics are substantially straight and when in said stressed configuration, at least part of said elongated sections are curved.
25. The IOL of claim 23 wherein when in said stressed configuration, said free ends decrease their radius of curvature in the anterior direction.
26. The IOL of claim 1 , wherein the elongated section of each haptic vaults anteriorly relative to the plane of the optic.
27. The IOL of claim 1 , wherein the elongated section of each haptic vaults anteriorly relative to the plane of the optic at an angle of between 5 and 15 degrees.
28. The IOL of claim 16 , wherein the elongated section of each haptic vaults anteriorly relative to the plane of the optic.
29. The IOL of claim 16 , wherein the elongated section of each haptic vaults anteriorly relative to the plane of the optic at an angle of between 5 and 15 degrees.