Daniel Thomas Bell

US Patent:

6976758, Dec 20, 2005

Filed:

Apr 4, 2003

Appl. No.:

10/408674

Inventors:

Peng Tee Khaw - London, GB
Peter G. Harrington - Seattle WA, US
Daniel M. Bell - Renton WA, US

Assignee:

Ocular Instruments, Inc. - Bellevue WA

International Classification:

A61B003/00
A61B003/10

US Classification:

351219, 351205

Abstract:

A gonioscopy lens employs a plurality of mirror sets so that substantially the entire periphery of the anterior chamber of an eye can be viewed without rotating or moving the contact lens. Each mirror set comprises a first mirror position anterior to the eye on one side of the optical axis and a second mirror positioned posterior to the first mirror on the opposite side of the optical axis. Each set is oriented relative to each other so that the second mirror receives light rays from the peripheral portion of the anterior chamber, reflects those rays to the second mirror to the first mirror, and then reflects the light rays in a generally anterior direction so that they can be used by an ophthalmologist employing the lens. The image viewed by the ophthalmologist is upright and located over its actual position.