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Journal of Biomedical Optics

Comparison of 1540-nm laser-induced injuries in ex vivo and in vitro rabbit corneal models
Author(s): Nicole McPherson; Thomas E. Eurell; Thomas E. Johnson
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Paper Abstract

Despite the increasing use of infrared lasers in medical, industrial, and military settings, data on threshold radiant exposures and median effective dose (ED50) as they relate to laser-tissue interaction are limited. Our goals were to determine the ED50 for single-pulse, 1540-nm laser exposures in ex vivo and in vitro rabbit corneal models and to characterize the histopathological changes associated with the laser-tissue interaction. An erbium-glass laser was used to deliver single, 1540-nm wavelength pulses to 27 ex vivo and 24 in vitro rabbit corneal models. The ex vivo model was exposed to single pulses of 0.8-ms duration and radiant energies ranging from 17.61 J/cm2 to 42.26 J/cm2. The in vitro corneal models were exposed to single pulses of 0.8 ms duration and had radiant exposures ranging from 14.87 to 29.72 J/cm2. Tissue exposure sites were observed for presence of a lesion immediately post-exposure and 24 h after exposure. Histopathological evaluations of tissue exposure sites were conducted 24 h after exposure. The ED50 was determined to be 21.24 J/cm2 for the in vitro rabbit corneal models and 30.86 J/cm2 for the ex vivo corneal models. Both the in vitro and ex vivo models displayed similar histopathological responses of tissue necrosis and epithelial cell proliferation.

Paper Details

Date Published: 1 November 2007
PDF: 7 pages
J. Biomed. Opt. 12(6) 064033 doi: 10.1117/1.2822371
Published in: Journal of Biomedical Optics Volume 12, Issue 6
Show Author Affiliations
Nicole McPherson, Uniformed Services Univ. of the Health Sciences (United States)
Thomas E. Eurell, Colorado State Univ. (United States)
Thomas E. Johnson, Colorado State Univ. (United States)

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