# US 8,465,543 B2 · Astigmatic intraocular lens

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- Number: US 8,465,543 B2
- Document ID: US8465543B2
- Status: Granted
- Kind: B2
- Application number: 11/916,635
- Filed: 2006-06-22
- Published: 2009-05-21
- Granted: 2013-06-18
- Earliest claimed: 2005-06-22
- Assignees: Carl Zeiss Meditec AG
- Applicants: Werner Fiala; Christine Kreiner
- Inventors: Werner Fiala; Christine Kreiner
- Web page: https://patentgrep.com/patent/US8465543B2

## CPC

- A61F 2/1602: {Corrective lenses for use in addition to the natural lenses of the eyes or for pseudo-phakic eyes}
- 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 2/1645: {Toric lenses}
- G02C 2202/22: Correction of higher order and chromatic aberrations, wave front measurement and calculation
- 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)
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

The invention concerns an intraocular lens for the correction of astigmatic ametropia, which has both a torically refractive front face and a torically refractive rear face. The intraocular lens also has a torically refractive lens surface whose section curve in at least one principal meridian is described by an asphere. Finally the intraocular lens has a torically refractive lens surface with two principal meridians which include an intermediate angle that is not equal to 90°.

## Claims

### Claim 1

An intraocular lens for the correction of an astigmatic ametropia comprising a torically refractive lens surface, wherein a total section curve in a principal meridian of the torically refractive lens surface in a plane parallel to a lens axis is described by an asphere according to an equation:
y=√{square root over (2Rx−(1+asp)x2)}
or
x
=
y
2
/
R
1
+
1
-
(
1
+
asp
)
⁢
y
2
/
R
2
+
∑
j
⁢
c
j
⁢
y
j
wherein
x is a first coordinate axis being in the direction of the lens axis,
y is a second coordinate axis being in the direction of a first principal meridian,
R is a radius or parameter at an apex of the lens,
asp is an asphericity in the meridian,
cj are polynomial coefficients,
wherein R is a value of a radius R1 of a curvature of the torically refractive lens surface in the first principal meridian and of a radius R2 of a curvature of the torically refractive lens surface in a second principal meridian, wherein R1 differs from R2,
wherein asp is a value of a first asphericity asp1 in the first principal meridian and of a second asphericity asp2 in the second principal meridian of the torically refractive lens surface, wherein asp1 is different from asp2,
wherein a meridian forming an angle α with the first principle meridian comprises an asphericity aspα which depends on the angle α.

### Claim 2 (depends on 1)

An intraocular lens according to claim 1 wherein the intraocular lens has both a torically refractive front face and also a torically refractive rear face.

### Claim 3 (depends on 2)

An intraocular lens according to claim 2 wherein the front face and the rear face are of a convex shape.

### Claim 4 (depends on 1)

An intraocular lens according to claim 1, wherein a cylindrical shape is substantially uniformly distributed to the front face and the rear face.

### Claim 5 (depends on 1)

An intraocular lens according to claim 1, wherein section curves of the torically refractive lens surface in both principal meridians in planes parallel to the lens axis are respectively described by an asphere.

### Claim 6 (depends on 1)

An intraocular lens according to claim 1, wherein said torically refractive lens surface has two principal meridians which include an intermediate angle that is not equal to 90°.

### Claim 7 (depends on 1)

An intraocular lens according to claim 1 wherein a front face of the intraocular lens and a rear face of the intraocular lens have a convex shape.