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Proceedings Paper

Light Levels In Ophthalmic Diagnostic Instruments
Author(s): Francois C. Delori; Oleg Pomerantzeff; Martin A. Mainster
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Paper Abstract

Methods are presented for determining the retinal exposures produced by broad-band ophthalmic light sources and for comparing these results with safety standards developed for the safe use of lasers (ANSI, Z136.1). Measurements of exposures produced by fundus cameras and indirect ophthalmoscopes are compared with both Z136.1 maximum permissible exposure levels (MPE) and experimental retinal damage thresholds. It is found that while the retinal exposures used in fundus photography are below MPEs, the irradiances used in indirect ophthalmoscopy may actually equal or exceed current MPEs. Methods are suggested for reducing retinal irradiance while maintaining retinal image luminance, and emphasis is placed on the importance of both acquainting the users of ophthalmic devices with any potential retinal hazard and providing the users and designers of ophthalmic devices with realistic protection standards.

Paper Details

Date Published: 7 October 1980
PDF: 7 pages
Proc. SPIE 0229, Ocular Effects of Non-Ionizing Radiation, (7 October 1980); doi: 10.1117/12.958799
Show Author Affiliations
Francois C. Delori, Eye Research Institute of Retina Foundation (United States)
Oleg Pomerantzeff, Eye Research Institute of Retina Foundation (United States)
Martin A. Mainster, Eye Research Institute of Retina Foundation (United States)

Published in SPIE Proceedings Vol. 0229:
Ocular Effects of Non-Ionizing Radiation
David H. Sliney; Myron Lee Wolbarsht, Editor(s)

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