Multifocal ophthalmic lenses

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

Reexamination Certificate

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Details

C351S177000

Reexamination Certificate

active

06179420

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to ophthalmic lenses. In particular, the invention provides lenses that use more than one optical power, or focal length, and are useful in the correction of presbyopia.
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 totally absent.
Among the methods used to correct for the eye's failure to accommodate is the mono-vision system in which a person is fitted with one contact lens for distance vision and one lens for near vision. The mono-vision system permits the wearer to distinguish both distance and near objects, but is disadvantageous in that a substantial loss in depth perception results. Thus, a need exists for lenses that both provide correction for the wearer's inability to accommodate and that overcomes some of the disadvantages of known lenses.


REFERENCES:
patent: 4890913 (1990-01-01), De Carle
patent: 5002382 (1991-03-01), Seidner
patent: 5024517 (1991-06-01), Seidner
patent: 5125729 (1992-06-01), Mercure
patent: 5484312 (1996-01-01), Roffman et al.
patent: 5485228 (1996-01-01), Roffman et al.
patent: 5574518 (1996-11-01), Mercure
patent: 5835192 (1998-11-01), Roffman et al.
patent: 0 201 231 (1986-11-01), None
patent: 0 453 136 (1991-10-01), None

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