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Proceedings Paper

Visible-lesion threshold dependency on retinal spot size for ultrashort laser pulses in the near infrared
Author(s): Clarence P. Cain; Cynthia A. Toth; Gary D. Noojin; David J. Stolarski; Dale J. Payne; Benjamin A. Rockwell
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Paper Abstract

Single pulses in the near-infrared (1060 nanometers) were used to measure retinal spot size dependence of minimum visible lesion (MVL) thresholds in rhesus monkey eyes at a pulsewidth of 150 femtoseconds. We report the MVL thresholds determined at 1 hour and 24 hours post exposure which were obtained with 2 different lenses placed in front of the eye to vary the retinal spot size. Also we report the fluorescein angiography thresholds (FAVL) for the above measurements. These new data points will be added to the databank for Retinal Maximum Permissible Exposure (MPE) as a function of spot size for this pulsewidth and a comparison will be made with previous spot size dependency studies. Our measurements show that the retinal ED50 threshold fluence decreases for increasing retinal spot sizes. The fluence at the MVL threshold decreased by a factor of 3 for an increase in retinal image diameter by a factor of 4.5 times from the smallest to largest spot size.

Paper Details

Date Published: 13 May 1998
PDF: 4 pages
Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); doi: 10.1117/12.308156
Show Author Affiliations
Clarence P. Cain, The Analytical Sciences Corp. (United States)
Cynthia A. Toth, Duke Univ. Eye Ctr. (United States)
Gary D. Noojin, The Analytical Sciences Corp. (United States)
David J. Stolarski, The Analytical Sciences Corp. (United States)
Dale J. Payne, Air Force Research Lab. (United States)
Benjamin A. Rockwell, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 3254:
Laser-Tissue Interaction IX
Steven L. Jacques; Jeff Lotz, Editor(s)

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