Gary M Lafferty

US Patent:

57608709, Jun 2, 1998

Filed:

Mar 31, 1997

Appl. No.:

8/829784

Inventors:

Rick Edward Payor - Lawrenceville GA
Xiaoxiao Zhang - Sewanee GA
Lewis Williams - Mascot, AU
Gary Lafferty - Cumming GA

Assignee:

CIBA Vision Corporation - Duluth GA

International Classification:

G02C 704

US Classification:

351160H

Abstract:

Contact lenses, especially toric and bifocal, which are rotationally stabilized and methods of stabilizing contact lenses. Contact lenses are stabilized, with respect to rotation while in place on the eye, by providing the lenses with a non-circular shape. In a preferred embodiment, a toric contact lens is rotationally stabilized by providing the lens with an oval shape. Also disclosed are methods of providing non-circular lenses with appropriate shapes for proper fit to a patient's eye.