# US 4,966,452 A · Contact lens for laser surgery

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- Number: US 4,966,452 A
- Document ID: US4966452A
- Status: Granted
- Kind: A
- Application number: 07/344,711
- Filed: 1989-04-27
- Granted: 1990-10-30
- Earliest claimed: 1989-04-27
- Assignees: Ocular Instruments, Inc.; Duke University
- Inventors: M. Bruce Shields; Phillip J. Erickson
- Web page: https://patentgrep.com/patent/US4966452A

## CPC

- 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 9/00821: {for coagulation}
- A61B 90/04: {Protection of tissue around surgical sites against effects of non-mechanical surgery, e.g. laser surgery (protection of eyes against laser radiation A61F9/022)}
- A61B 2090/049: {against light, e.g. laser}
- A61F 2009/00868: {Ciliary muscles or trabecular meshwork}
- A61F 2009/00891: {Glaucoma}
- 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)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A contact lens for use in connection with transscleral cyclophotocoagulation. The lens has a planar entry surface and a frustoconically-shaped exit surface that contacts the sclera surrounding the cornea. The central portion of the lens is opaque to prevent stray laser light from entering the optical portion of the eye during laser application.

## Claims

### Claim 1

A lens for use in ophthalmic surgery comprising:
a contact lens having an entry surface and a frustoconically-shaped exit surface, said exit surface being angled superiorly toward said entry surface and inwardly relative to the optical axis of said lens, said entry surface being adapted to contact a region on the sclera surrounding the cornea, said lens having a concave recess located inwardly from said exit surface, said recess having a curvature slightly steeper than the average human cornea, said recess being adapted to protect but be spaced from the corneal epithelium when said exit surface contacts said sclera.

### Claim 2 (depends on 1)

The lens of claim 1, wherein said lens has an opaque region in the central portion thereof.

### Claim 3 (depends on 2)

The lens of claim 2, wherein said opaque region surrounds the optical axis and is immediately superior to said recess.

### Claim 4 (depends on 1)

The lens of claim 1, wherein said exit surface further has a plurality of radially-spaced marks along a first diameter and a plurality of radially-spaced marks along another diameter orthogonal to said first.

### Claim 5 (depends on 1)

The lens of claim 1, wherein the angle of said exit surface to said axis is approximately 55.degree..

### Claim 6 (depends on 1)

The lens of claim 1, wherein the radius of said recess is in the range of 6.0 mm to 8.0 mm.

### Claim 7 (depends on 6)

The lens of claim 6, wherein the radius of said recess is approximately 7.45 mm.