Claims
- 1. A process for making an intraocular lens having a clear central lens portion and a peripheral lens portion, said peripheral lens portion having a reduced, graded transmissivity ranging from lowest at the outer extremity thereof to highest at the junction with said clear central lens portion, and peripheral lens portion extending completely about the periphery of said clear central lens portion, the process comprising:
- a. forming a cylinder of appropriate material, larger in diameter than the diameter of the lens to be made;
- b. forming a colored layer on the surface of the cylinder produced in step (a);
- c. heating and drawing the cylinder produced in step (b) to an appropriate diameter whereby graded transmissivity is obtained, the degree depending on the amount of drawing; and,
- d. lath cutting the cylinder produced in step (c) to form the lens.
- 2. The process of claim 1 in which step (b) is performed by extruding a layer of colored material on the surface of the cylinder produced in step (a).
- 3. The process of claim 1 in which step (b) is performed by dyeing the surface of the cylinder produced in step (a).
- 4. A process as in any preceding claim in which the lens to be made bears positioning loops attached to the peripheral portion of the lens, and the loops are fabricated, together with the lens, in step (d).
Parent Case Info
This application is a divisional of application Ser. No. 761,408, filed Aug. 1, 1985, and now U.S. Pat. No. 4,676,791.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2124500 |
Feb 1984 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Rayner and Keeler Limited, Catalogue No. 469, 2 pages. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
761408 |
Aug 1985 |
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