# US 11,076,756 B2 · System and method for measuring and correcting astigmatism using laser generated corneal incisions

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- Number: US 11,076,756 B2
- Document ID: US11076756B2
- Status: Granted
- Kind: B2
- Application number: 15/687,501
- Filed: 2017-08-27
- Published: 2017-12-14
- Granted: 2021-08-03
- Earliest claimed: 2010-02-01
- Assignees: Lensar, Inc.
- Applicants: Lensar, Inc.
- Inventors: Rudolph W. Frey
- Web page: https://patentgrep.com/patent/US11076756B2

## CPC

- A61B 3/1035: {for measuring astigmatism (testing astigmatism A61B3/036)}
- A61B 3/107: for determining the shape or measuring the curvature of the cornea
- A61F 9/00825: {for photodisruption}
- A61F 9/00827: {Refractive correction, e.g. lenticle}
- A61F 9/00834: {Inlays; Onlays; Intraocular lenses [IOL]}
- A61F 2009/00853: {Laser thermal keratoplasty or radial keratotomy}
- A61F 2009/0087: {Lens}
- A61F 2009/00872: {Cornea}
- A61F 2009/00887: {Cataract}
- A61F 2009/00889: {Capsulotomy}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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 laser system that includes a laser source emitting a laser beam along an axis and a keratometer. The keratometer includes a first set of individual light sources that are equally spaced from one another along a first ring and that direct a first light toward an eye and a second set of individual light sources that are equally spaced from another along a second ring and direct a second light toward the eye, wherein the first ring and said second ring are co-planar and concentric with one another about the axis. The laser system includes a telecentric lens that receives the first light and second light reflected off of the eye and a detector that receives light from the telecentric lens and forms an image. The laser system also includes a processor that receives signals from said detector representative of the image and determines an astigmatism axis of the eye based on the signals.

## Claims

### Claim 1

A method of determining properties of an eye, the method comprising:
measuring properties of an astigmatism axis of an eye determining a first reflected ring image of the eye to be an ellipse, determining a second reflected ring image of the eye to be an ellipse; determining clock angles of the ellipses; and determining an astigmatism axis of the eye based upon the clock angles;
wherein the reflected ring images have diameters of from 1.5 mm to 3 mm;
positioning the eye to receive a treatment laser beam that is emitted by a treatment laser source along a treatment laser beam axis; and,
aligning the therapeutic laser beam axis with the determined astigmatic axis.

### Claim 2 (depends on 1)

The method of claim 1, wherein an optical power of a steep axis and a shallow axis of the eye is determined.

### Claim 3 (depends on 1)

The method of claim 1, comprising: controlling the treatment laser beam whereby the treatment laser beam performs a cutting of the eye based on the determined astigmatism axis.

### Claim 4 (depends on 3)

The method of claim 3, wherein the cutting of the eye generates a mark representative of an orientation of the determined astigmatism axis.

### Claim 5 (depends on 3)

The method of claim 3, wherein the cutting of the eye creates a limbal relaxing incision.

### Claim 6 (depends on 2)

The method of claim 2, comprising: controlling the treatment laser beam whereby the treatment laser beam performs a cutting of the eye based on the determined astigmatism axis.