Ophthalmic lenses for high order aberration correction and...

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

Reexamination Certificate

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C351S161000, C351S168000

Reexamination Certificate

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06554425

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to multifocal ophthalmic lenses. In particular, the invention provides lenses that have zones of more than one optical power, or focal length. The lenses correct for high order optical aberrations in more than one field of gaze.
BACKGROUND OF THE INVENTION
As an individual ages, the eye is less able to accommodate, or bend the natural lens, to focus on objects that are relatively near to the observer. This condition is known as presbyopia. Similarly, for persons who have had their natural lens removed and an intraocular lens inserted as a replacement, the ability to accommodate is absent.
Among the methods used to correct for the eye's failure to accommodate are lenses that have more than one optical power. In particular, spectacle, contact and intraocular lenses have been developed in which zones of distance, near, and intermediate power are provided. These lenses are disadvantageous because they only provide correction for low order optical aberrations, such as defocus and astigmatism, leaving higher order aberrations uncorrected. Thus, a need exists for a multifocal lens capable of correcting higher order optical aberrations.


REFERENCES:
patent: 4787733 (1988-11-01), Silva
patent: 5050981 (1991-09-01), Roffman
patent: 5114628 (1992-05-01), Hofer et al.
patent: 5682223 (1997-10-01), Menezes et al.
patent: 5777719 (1998-07-01), Williams et al.
patent: 5815239 (1998-09-01), Chapman et al.
patent: 5822091 (1998-10-01), Baker
patent: 5953098 (1999-09-01), Lieberman et al.
patent: 6086204 (2000-07-01), Magnante
patent: 6095651 (2000-08-01), Wlliams et al.
patent: 6145987 (2000-11-01), Baude et al.
patent: WO 92/01417 (1992-02-01), None
patent: WO 99/27334 (1999-06-01), None
PCT Search Report—Application PCT/US 01/29540—Date of Mailing May 10, 2002.

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