Series of aspherical contact lenses

Details Series of aspherical contact lenses Series of aspherical contact lenses

2008-04-10

2009-02-17

Collins, Darryl J (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

Reexamination Certificate

active

07490937

ABSTRACT:
The present invention provides a series of aspherical contact lenses, each lens having a first central optical zone on its anterior surface and a second central optical zone on its posterior surface. Both central optical zones are aspherical surfaces. The first central optical zone is designed to have a surface which provides a target optical power and an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diameter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.

REFERENCES:
patent: 4195919 (1980-04-01), Shelton
patent: 5771088 (1998-06-01), Perrott
patent: 5815239 (1998-09-01), Chapman et al.
patent: 6726323 (2004-04-01), Miyamura et al.
patent: 7147325 (2006-12-01), Gotou et al.

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