# US 2016/0250074 A1 · Systems and methods for femtosecond laser photorefractive keratectomy

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- Number: US 2016/0250074 A1
- Document ID: US20160250074A1
- Status: Published application
- Kind: A1
- Application number: 14/968,618
- Filed: 2015-12-14
- Published: 2016-09-01
- Earliest claimed: 2015-02-26
- Assignees: AMO Development, LLC
- Applicants: AMO Development, LLC
- Inventors: Hong Fu
- Web page: https://patentgrep.com/patent/US20160250074A1

## CPC

- A61F 9/00814: {Laser features or special beam parameters therefor}
- A61F 9/00808: {Inducing higher orders, e.g. for correction of presbyopia}
- A61F 9/00827: {Refractive correction, e.g. lenticle}
- A61F 9/00836: {Flap cutting}
- A61F 9/00838: {Correction of presbyopia}
- A61F 9/009: Auxiliary devices making contact with the eyeball and coupling in laser light, {e.g. goniolenses (apparatus for eye examination A61B3/0008)}
- A61F 2009/00872: {Cornea}
- A61F 2009/00895: {Presbyopia}
- A61F 2009/00897: {Scanning mechanisms or algorithms}
- 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

Embodiments of this invention generally relate to ophthalmic laser procedures and, more particularly, to systems and methods for photorefractive keratectomy. In an embodiment, an ophthalmic surgical laser system comprises a laser source generating a pulsed laser beam and a laser delivery system delivering the pulsed laser beam to a cornea of an eye. A patient interface couples to and constrains the eye relative to the laser delivery system. A controller controls the laser delivery system to perform an anterior surface volume dissection on the cornea.

## Claims

### Claim 1

An ophthalmic surgical laser system comprising:
a laser source generating a pulsed laser beam;
a laser delivery system delivering the pulsed laser beam to a cornea of an eye;
a patient interface coupling to and constraining the eye relative to the laser delivery system;
a controller controlling the laser delivery system to perform an anterior surface volume dissection on the cornea.

### Claim 2 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein the laser source is a femtosecond laser.

### Claim 3 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein the laser source is a UV 355 nm laser.

### Claim 4 (depends on 2)

The ophthalmic surgical laser system of claim 2, wherein a surface of the patient interface in contact with the cornea is flat.

### Claim 5 (depends on 3)

The ophthalmic surgical laser system of claim 3, wherein a surface of the patient interface in contact with the cornea is flat.

### Claim 6 (depends on 2)

The ophthalmic surgical laser system of claim 2, wherein a surface of the patient interface in contact with the cornea is curved.

### Claim 7 (depends on 3)

The ophthalmic surgical laser system of claim 3, wherein a surface of the patient interface in contact with the cornea is curved.

### Claim 8 (depends on 4, 5, 6, 7)

The ophthalmic surgical laser system of claims 4, 5, 6 and 7, wherein the laser delivery system scans the cornea by point-to-point scanning.

### Claim 9 (depends on 4, 5, 6, 7)

The ophthalmic surgical laser system of claims 4, 5, 6 and 7, wherein the laser delivery system scans the cornea by fast scan line scanning.

### Claim 10 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein a portion of the patient interface in contact with the cornea is a liquid interface.

### Claim 11 (depends on 1)

The ophthalmic surgical laser system of claim 1, wherein a depth of focus of the pulsed laser beam is under 10 μm and is given by:
Δ
=
0.905
·
λ
(
NA
)
2
where Δ is the depth of focus in cornea, is the laser wavelength, and NA is the numerical aperture of the focusing beam.

### Claim 12

A method for correcting vision in an eye using an ophthalmic surgical laser system, comprising the steps of:
coupling the eye to a patient interface to constrain the eye relative to the system;
generating a pulsed laser beam by a laser source;
delivering the pulsed laser beam to a cornea in the eye by a laser delivery system; and
controlling the laser delivery system by a controller to perform an anterior surface volume dissection in the cornea.

### Claim 13 (depends on 12)

The method of claim 12, wherein the controller controls the anterior surface volume dissection to correct myopia or myopia with other accompanying refractive errors.

### Claim 14 (depends on 12)

The method of claim 12, wherein the controller controls the anterior surface volume dissection to correct hyperopia or hyperopia with other accompanying refractive errors.

### Claim 15 (depends on 12)

The method of claim 12, wherein the controller controls the anterior surface volume dissection to correct presbyopia or presbyopia with other accompanying refractive errors.