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Proceedings Paper

Corneal injury thresholds for exposures to 1.54-μm radiation
Author(s): Russell L. McCally; Jennifer Bonney-Ray; C. Brent Bargeron
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Paper Abstract

Corneal epithelial injury thresholds have been determined for exposures to 1.54 μm infrared radiation having durations from 1 to 100 sec and beam diameters from 0.5 to 7 mm. For 1 sec exposures, measured thresholds range from 12 W/cm2 (5 mm diameter beam ) to 67 W/cm2 (0.5 mm diameter). For 2 sec exposures, they range from 9 W/cm2 (7mm diameter) to 57 W/cm2 (0.5 mm diameter). For 10 sec exposures, they range from 3.7 W/cm2 (7mm diameter) to 33 W/cm2 (0.5 mm diameter). For 100 sec exposures, they are 1.4 W/cm2 (7mm diameter) and 3.7 W/cm2 (2mm diameter). The dependence of the measured thresholds on laser beam diameter provides strong evidence supporting a critical temperature damage model. These measured thresholds are greater than 10 times the maximum permissible exposure (MPE) in ANSI Z-136.5-2000.

Paper Details

Date Published: 20 June 2003
PDF: 6 pages
Proc. SPIE 4953, Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment III, (20 June 2003); doi: 10.1117/12.479760
Show Author Affiliations
Russell L. McCally, Johns Hopkins Univ. Applied Physics Lab. (United States)
Wilmer Ophthalmological Institute (United States)
Jennifer Bonney-Ray, Johns Hopkins Univ. Applied Physics Lab. (United States)
C. Brent Bargeron, Johns Hopkins Univ. Applied Physics Lab. (United States)


Published in SPIE Proceedings Vol. 4953:
Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment III
Bruce E. Stuck; Michael Belkin, Editor(s)

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