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Proceedings Paper

Variation of laser-induced retinal damage threshold with retinal image size (Abstract Only)
Author(s): Joseph A. Zuclich; David J. Lund; Peter R. Edsall; Richard C. Hollins; Peter Alan Smith; Bruce E. Stuck; Leon N. McLin; Paul K. Kennedy; Stephen Till
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Paper Abstract

The dependence of retinal damage threshold on laser spot size was examined for two pulsewidth regimes; nanosecond- duration Q-switched pluses from a doubled Nd:YAG laser and microsecond-duration pulses from a flashlamp-pumped dye laser. Threshold determination were conducted for nominal retinal image sizes ranging form 1.5 mrad to 100 mrad of visual field, corresponding to image diameters of approximately 22 micrometers to 1.4 mm on the primate retina. Together, this set of retinal damage threshold reveals the functional dependence of threshold on spot size. The threshold dose was found to vary with the area of the image for larger image sizes. The experimental results were compared to the predictions of the Thompson-Gerstman granular model of laser-induced retinal damage. The experimental and theoretical trends of threshold variation with retinal spot size were essentially the same, with both data sets showing threshold dose proportional to image area for spot sizes >= 150 micrometers . The absolute values predicted by the model, however, were significantly higher than experimental values, possibly because of uncertainty in various biological input parameters, such as the melanosome absorption coefficient and the number of melanosomes per RPE cell.

Paper Details

Date Published: 3 March 2000
PDF: 3 pages
Proc. SPIE 3902, Laser-Induced Damage in Optical Materials: 1999, (3 March 2000); doi: 10.1117/12.379345
Show Author Affiliations
Joseph A. Zuclich, The Analytical Sciences Corp., Inc. (United States)
David J. Lund, U.S. Army Medical Research Detachment (United States)
Peter R. Edsall, The Analytical Sciences Corp., Inc. (United States)
Richard C. Hollins, Defence Evaluation and Research Agency Malvern (United Kingdom)
Peter Alan Smith, Defence Evaluation and Research Agency Farnborough (United States)
Bruce E. Stuck, U.S. Army Medical Research Detachment (United States)
Leon N. McLin, Air Force Research Lab. (United States)
Paul K. Kennedy, Air Force Research Lab. (United States)
Stephen Till, Defence Evaluation and Research Agency Malvern (United Kingdom)


Published in SPIE Proceedings Vol. 3902:
Laser-Induced Damage in Optical Materials: 1999
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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