Pseudo-accommodative IOL having diffractive zones with...

Details Pseudo-accommodative IOL having diffractive zones with... Pseudo-accommodative IOL having diffractive zones with...

2006-02-09

2008-10-28

Collins, Darryl J (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S161000, C623S006270, C623S006300, C623S006310

Reexamination Certificate

active

07441894

ABSTRACT:
In one aspect of the invention, a trifocal ophthalmic lens is disclosed that includes an optic having at least one optical surface, and a plurality of diffractive zones that are disposed on a portion of that surface about an optical axis of the optic. At least two of those diffractive zones have different areas so as to cause broadening of optical energy profiles at a near and a far foci of the diffractive zones for generating an intermediate focus.

REFERENCES:
patent: 5344447 (1994-09-01), Swanson
patent: 5699142 (1997-12-01), Lee et al.
patent: 6554859 (2003-04-01), Lang et al.
patent: 2003/0043342 (2003-03-01), Seidner
patent: 0343067 (1989-11-01), None
patent: 0367878 (1990-05-01), None
patent: WO 9411765 (1994-05-01), None

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