Field of vision collimator
US5754274A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Sep 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/30
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A field of view collimator for self-monitoring peripheral vision loss. The field of view collimator includes a hand-held housing having a viewing aperture for placement adjacent to the subject's eye. A lens projects an image to the eye. The image, in the form of a circular edge, is formed by an iris diaphragm positioned behind the lens. The angular size of the image is adjustable by opening or closing the iris diaphragm. A diffuser is positioned behind the iris diaphragm to provide an even back-illumination. Indicia markings indicate the measured field of view. The device is particularly suitable for home use by persons with glaucoma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.