# US 2009/0270984 A1 · Intraocular lens

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- Number: US 2009/0270984 A1
- Document ID: US20090270984A1
- Status: Published application
- Kind: A1
- Application number: 12/304,651
- Filed: 2007-05-31
- Published: 2009-10-29
- Earliest claimed: 2006-06-14
- Assignees: Hoya Corporation
- Inventors: Demas Sanger; Tjundewo Lawu
- Web page: https://patentgrep.com/patent/US20090270984A1

## CPC

- A61F 2/1624: {having adjustable focus; power activated variable focus means, e.g. mechanically or electrically by the ciliary muscle or from the outside}
- A61F 2/1613: {having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus}
- A61F 2/1618: {Multifocal lenses}
- A61F 2/1637: {Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses}
- A61F 2/164: {Aspheric lenses}
- A61F 2002/1699: {Additional features not otherwise provided for}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

An intraocular lens in which deterioration in contrast is suppressed even when the optical axis of the intraocular lens is decentred from the optical axis of the eyeball when the intraocular lens is inserted into the eye while the advantage of a conventional aberration reduction type intraocular lens that the image is seen clearly is sustained by employing such a power distribution as respectively having at least one positive power deviation region (E1) having a power larger than that represented by the reference power distribution and at least one negative power deviation region (E2) having a power smaller than that represented by the reference power distribution in the central region of the intraocular lens assuming that a power distribution being set to cancel the spherical aberration of cornea when the intraocular lens is inserted into the eye is the reference power distribution.

## Claims

### Claim 1

An intraocular lens in which deterioration in contrast is suppressed when an optical axis of the intraocular lens inserted into an eye is decentred from an optical axis of an eyeball, by employing such a power distribution as respectively having at least one positive power deviation region having a larger power than that represented by a reference power distribution and at least one negative power deviation region having a smaller power than that represented by the reference power distribution in a region in the vicinity of the center of the intraocular lens, assuming that the reference power distribution being set to cancel a spherical aberration of cornea when the intraocular lens is inserted into the eye.

### Claim 2 (depends on 1)

The intraocular lens according to claim 1, wherein each of the positive power deviation region and the negative power deviation region is a circular region or an annular region centering around an optical axis.

### Claim 3 (depends on 1, 2)

The intraocular lens according to claim 1 or 2, wherein the central region has a substantially circular shape centering around the optical axis having a radius not less than 0.7 mm and not more than 1.75 mm.

### Claim 4 (depends on 1, 2, 3)

The intraocular lens according to any one of claims 1 to 3, wherein a mean value of power deviation amounts from a reference power of the positive power deviation region is not less than 0.1 diopter and not more than diopter, and a mean value of power deviation amounts from of a reference power of the negative power deviation region is not less than 0.1 diopter and not more than diopter.