System and method for projecting an image (such as an ERG pattern) significantly anterior to the posterior retina
US5233373A · kind A · utility
Inventors
Key dates
| Filing date | Jan 23, 1992 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Jan 23, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/398
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pattern ERG (PERG) projector (FIG. 2a) includes a coherent light source (32) for generating a projection beam, modulation optics (34) for modulating the projection beam with an alternating ERG interference pattern (with a selected spatial and alternation frequency), segmentation optics 35 for selectively segmenting the ERG interference pattern, and wide-angle imaging optics (36) for focusing the projection beam such that it passes through the pupil, and then diverges to project onto the entire retinal field-of-view, including the anterior retina out to the far periphery. A PERG testing program can be used to selectively probe the entire retina and develop a retinal map--PERG data has been correlated with retinal ganglion cell viability, and is therefore useful in diagnosing and monitoring retinal degeneration caused by glaucoma and other diseases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.