13 May 1998 Visible-lesion threshold dependency on retinal spot size for ultrashort laser pulses in the near infrared
Author Affiliations +
Proceedings Volume 3254, Laser-Tissue Interaction IX; (1998) https://doi.org/10.1117/12.308156
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Clarence P. Cain, Cynthia A. Toth, Gary D. Noojin, David J. Stolarski, Dale J. Payne, and Benjamin A. Rockwell "Visible-lesion threshold dependency on retinal spot size for ultrashort laser pulses in the near infrared", Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); doi: 10.1117/12.308156; https://doi.org/10.1117/12.308156

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