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Proceedings Paper

Laser-induced retinal injury thresholds: variation with retinal irradiated areas
Author(s): David J. Lund; Karl Schulmeister; Bernhard Seiser; Florian Edthofer
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Paper Abstract

The retinal injury threshold for exposure to a laser source varies as a function of the irradiated area on the retina. Currently accepted guidelines for the safe use of lasers provide that the MPE will increase as the diameter of the irradiated area for retinal diameters between 25 mm and 1700 mm, based on the ED50 data available in the late 1970s. Recent studies by Zuclich and Lund produced data showing that the ED50 for ns-duration exposures at 532 nm and ms duration exposures at 590 nm varied as the square of the diameter of the irradiated area on the retina. This paper will discuss efforts to resolve the disagreement between the new data and the earlier data though an analysis of all accessible data relating the retinal injury threshold to the diameter of the incident beam on the retina and through simulations using computer models of laser-induced injury. The results show that the retinal radiant exposure required to produce retinal injury is a function of both exposure duration and retinal irradiance diameter and that the current guidelines for irradiance diameter dependence do not accurately reflect the variation of the threshold data.

Paper Details

Date Published: 18 April 2005
PDF: 10 pages
Proc. SPIE 5688, Ophthalmic Technologies XV, (18 April 2005); doi: 10.1117/12.608417
Show Author Affiliations
David J. Lund, U.S. Army Medical Research Detachment (United States)
Karl Schulmeister, ARC Seibersdorf Research GmbH (Austria)
Bernhard Seiser, ARC Seibersdorf Research GmbH (Austria)
Florian Edthofer, ARC Seibersdorf Research GmbH (Austria)

Published in SPIE Proceedings Vol. 5688:
Ophthalmic Technologies XV
Fabrice Manns; Bruce E. Stuck; Michael Belkin M.D.; Per G. Söderberg; Arthur Ho, Editor(s)

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