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Intraocular multifocal lens

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Intraocular multifocal lens


A multifocal intraocular lens providing greater or lesser refraction in relation to the position of the head and eyes of a user. The lens body is inserted into an artificial capsule bag or into a fluid-filled enucleated natural lens capsule of an eye, wherein the lens body encompasses the optical axis of the eye and by movement of the lens body within the capsule, provides different greater or lesser refraction depending upon the position of the eye.
Related Terms: Lens Capsule Multifocal

Inventor: Marguerite B. McDonald
USPTO Applicaton #: #20120330414 - Class: 623 624 (USPTO) - 12/27/12 - Class 623 
Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor > Eye Prosthesis (e.g., Lens Or Corneal Implant, Or Artificial Eye, Etc.) >Intraocular Lens >Aspheric Lens >Multifocal Lens

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The Patent Description & Claims data below is from USPTO Patent Application 20120330414, Intraocular multifocal lens.

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This application is a continuation of U.S. patent application Ser. No. 11/464,005, which is a continuation of U.S. patent application Ser. No. 10/706,630, filed Nov. 12, 2003, now issued as U.S. Pat. No. 7,144,423, by Marguerite B. McDonald, and is entitled to those filing dates for priority. The specification and drawings of U.S. patent application Ser. Nos. 11/464,005 and 10/706,630 are incorporated herein in their entirety by specific reference for all purposes.

TECHNICAL

FIELD OF THE INVENTION

This invention relates to intraocular lenses (IOLs), specifically, to IOLs that may have a plurality of refractive indices.

BACKGROUND OF THE INVENTION

The human eye includes an anterior chamber between the cornea and iris, a posterior chamber, defined by a capsular bag, containing a crystalline lens enclosed by a clear capsule, a vitreous chamber behind the lens containing the vitreous humor, and a retina at the rear of this chamber. The human eye has a natural accommodation ability. The constriction or contraction and relaxation of the ciliary muscle provides the eye with near and distant vision, respectively. This ciliary muscle action shapes the natural crystalline lens to the appropriate optical configuration for focusing light rays entering the eye on the retina. The removal of the natural lens leaves the eye with no means to focus at different distances and necessitates the use of bifocal lenses for near and far work.

Many different IOL designs have been developed over the years and proven successful in phakic and aphakic eyes. IOL implants have been used for years in aphakic eyes as replacements for diseased natural crystalline lenses that have been surgically removed from the eyes. IOLs for aphakic eyes are now implanted after cataract surgery in over 98% of the cases. Visual acuity deficiencies remaining after cataract surgery such as myopia (nearsightedness), hyperopia (farsightedness), and presbyopia (age-related farsightedness) are typically corrected with eyeglasses or contact lenses, though the accuracy of IOL power calcaulation has decreased the need for full-time postoperative spectacle use. The use of surgically implanted phakic IOLs as a permanent form of refractive correction has been gaining in popularity as well, though they are still considered investigational.

IOLs are generally of a fixed focal length. Fused bifocal and aspheric lenses have two or more optical focal planes that are engaged by changing the relationship of the light path or the observer to the lens. All such lenses require movement of either the lens (not possible with a standard IOL), light path, or observer to engage a different focal plane and can therefore be difficult to use. They also have an adverse effect on contrast sensitivity and can cause glare, halos, double vision (polyopia), and other optical aberration all of which compromises visual quality.

Accordingly, there is a need for a multifocal intraocular lens having a variable power of refraction that does not require deliberate engagement of different focal planes for near and far vision.

SUMMARY

OF THE INVENTION

In accordance with the present invention, a multifocal intraocular lens provides greater or lesser refraction in relation to the position of the head and eyes of a user. A multifocal intraocular lens body for insertion into a fluid- or gel-filled enucleated natural lens capsule of an eye is provided wherein the lens body encompasses the optical axis of the eye and provides different greater or lesser refraction depending upon the position of the eye. In another embodiment, the lens body can be used with an artificial lens capsule implanted within an eye.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and for further advantages thereof, reference is now made to the following Description of the Preferred Embodiments taken in conjunction with the accompanying Drawings.

FIG. 1 is a sectional view of a human eye illustrating the basic components of the eye.

FIG. 2 is a sectional view of a human eye illustrating the present intraocular lens body inserted within the artificial capsule situated within an eye.

FIG. 3 is a side-elevated view of the present intraocular lens body and artificial capsule shown in FIG. 2.

FIG. 4 is a plan view of the present intraocular lens body shown in FIG. 2.

FIG. 5 is a sectional view of a human eye illustrating the present intraocular lens body inserted within the natural lens capsule of an eye.

FIG. 6 is a sectional view of the present intraocular lens body through the line 6-6 of FIG. 3.

FIG. 7 is a sectional view of the present intraocular lens body through the line 7-7 of FIG. 3.

DETAILED DESCRIPTION

OF EXEMPLARY EMBODIMENTS

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Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20120330414 A1
Publish Date
12/27/2012
Document #
13606366
File Date
09/07/2012
USPTO Class
623/624
Other USPTO Classes
623/627
International Class
61F2/16
Drawings
8


Lens Capsule
Multifocal


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