Retinal, Camera for Small Undilated Pupils.
Abstract
The present invention provides an improved camera system designed to obviate the problems associated with the camera system of cited patents and to satisfy this need. The unique technique of the present invention incorporated by the improved camera system employs a tiny solid mirror, in contradistinction to the annular mirror with a central hole of the prior art, for reflecting the collected illuminating rays of light from the light source into the eye. The tiny mirror is suspended in front of the eye at the location of a beam crossover point formed by the collected rays of light coming from the light source. The angle in which the rays cross over at this point or region depends on the focal length of the light collecting lens, its diameter and other known parameters. This angle should be of a size fitting the pupil opening of the eye being examined. The eye pupil determines the area of retinal illumination. The tiny mirror is also suspended in the space traversed by light rays reflected from the retina; however, because of its small diameter, the mirror obstructs very little of the retinal-reflected rays to be collected by the imaging arrangement of the camera system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 16, 1981
- Accession Number
- ADD009221
Entities
People
- Radames K. H. Gebel
Organizations
- United States Department of the Air Force