Differential thickness contact lens utilizing multiple base curv

Details Differential thickness contact lens utilizing multiple base curv Differential thickness contact lens utilizing multiple base curv

1998-12-21

1999-11-23

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, G02C 704

Patent

active

059888130

ABSTRACT:
A method of producing a compensated contact lens that is compensated for power deviation from target due to differential shrinkage, and also a compensated contact lens. The invention includes the steps of designing a lens to have first and second areas of different thickness and a cylinder axis having a predetermined angular position; determining a plurality of power correction factors, one for each of a plurality of cylinder axis ranges of the lens; and modifying the lens using a selected one of the plurality of power correction factors corresponding to the cylinder axis ranges of the lens containing the cylinder axis of the lens.

REFERENCES:
patent: 4573774 (1986-03-01), Sitterle
patent: 5650837 (1997-07-01), Roffman et al.
patent: 5652638 (1997-07-01), Roffman et al.

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