# US 9,433,496 B2 · Aspherical multifocal intraocular lens

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- Number: US 9,433,496 B2
- Document ID: US9433496B2
- Status: Granted
- Kind: B2
- Application number: 13/671,900
- Filed: 2012-11-08
- Published: 2014-05-08
- Granted: 2016-09-06
- Earliest claimed: 2012-11-08
- Assignees: Lenstec Barbados Inc.
- Applicants: Lenstec Barbados Inc.
- Inventors: John Clough
- Web page: https://patentgrep.com/patent/US9433496B2

## CPC

- A61F 2/1618: {Multifocal lenses}
- A61F 2/16: Intraocular lenses
- 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 2/164: {Aspheric lenses}
- A61F 2/1648: {Multipart 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 2002/1689: {having plate-haptics}
- A61F 2250/0053: differing in optical properties
- 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

A multifocal intraocular lens has an anterior lens surface which includes a first optic of a first radius and a second optic of a different radius. The posterior surface of the lens include an aspheric surface.

## Claims

### Claim 1

A bifocal lens comprising:
a posterior aspheric lens surface having a first radius of curvature,
an anterior aspheric lens surface, said anterior aspheric lens surface having a first aspheric distance optic portion having a radius of curvature equal to the first radius of curvature of the posterior aspheric lens surface,
a second near optic portion having a radius of curvature less than that of the first portion thereby forming a second optic surface on the anterior lens surface,
the first aspheric distance optic portion having a perimeter and the second near optic portion having a perimeter,
a flat surface extending outwardly from the entire radially outer periphery of the anterior lens near optic portion, and
a first haptic extending from a top portion of said bifocal lens and a second haptic extending from a lower portion of said bifocal lens, each haptic including a first and second leg extending from the bifocal lens and a cross member extending between the legs, and a footplate located at a distal end of each leg.

### Claim 2 (depends on 1)

A bifocal lens as claimed in claim 1 wherein the flat surface lies in a plane which is parallel to a longitudinal axis of the lens.

### Claim 3 (depends on 1)

A bifocal lens as claimed in claim 1 wherein the distance optic portion on the anterior surface is about 50% to 70% of the anterior surface of the lens and the near optic portion is about 50% to 30% of the anterior surface of the lens.

### Claim 4 (depends on 1)

The bifocal lens of claim 1 wherein the distance optic portion on the anterior surface is about 60% of the anterior surface and the near optic on the anterior surface is about 40% of the anterior surface.

### Claim 5 (depends on 1)

A bifocal lens according to claim 1 wherein the posterior aspherical lens surface, the anterior aspherical distance optic portion and the second near optic portion of the anterior aspheric surface are convex.

### Claim 6

A bifocal lens comprising a lens body having an outermost annular circumferential edge and having a posterior aspheric lens surface having a first radius of curvature and an anterior aspheric lens surface having a first aspheric distance optic having a radius of curvature equal to the first radius of curvature of the posterior aspheric lens surface and a second near portion having a radius of curvature less than that of the first portion thereby forming a flat surface extending outwardly from an outer periphery of the second near portion to the annular circumferential edge of the lens body; and
a first haptic extending from a top portion of said lens body and a second haptic extending from a lower portion of said lens body, each haptic including a first leg and a second leg extending from the lens body and a cross member extending between the legs, and a footplate located at a distal end of each leg.