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Proceedings Paper

Corneal injury from 1318-nm single laser pulses
Author(s): William P. Roach; Bryan K. Ketzenberger; Margaret B. Burton; Thomas E. Johnson
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Paper Abstract

Threshold, median effective dose, and the mechanism of laser-tissue interaction are not well defined at the 1318-nm wavelength for human corneal exposures. The goals of this research effort are to identify at-risk groups, characterize the lesions imposed, and establish the ED50 for single pulse 1318-nm laser exposures on the cornea. A Neodymium: Yttrium Aluminum Garnet (Nd:YAG) laser was used to deliver 1318-nm wavelength pulses to the corneas of ten female Dutch Belted rabbits (Oryctolagus cuniculus). Single pulses of 0.5-ms duration and radiant beam energy ranging from 116 to 2250 joules/per square centimeter (J/cm2) were used. Exposure sites were clinically evaluated acutely, one hour and twenty-four hours post-exposure for the presence of a lesion. Results from the twenty-four hour evaluation were used to determine the ED50. Grossly, the lesions appeared as small, circular, well-demarcated, white, opaque lesions. Histologically, the lesions appeared as conical shaped coagulative necrosis with the base of the lesion at the epithelial surface of the cornea and extending to the apex at the endothelial border of the cornea. The ED50 for 1318-nm exposures to the rabbit cornea was determined to be 383 J/cm2 for a 0.1-mm spot size as measured at 1/e2.

Paper Details

Date Published: 27 June 2002
PDF: 10 pages
Proc. SPIE 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, (27 June 2002); doi: 10.1117/12.472542
Show Author Affiliations
William P. Roach, Uniformed Services Univ. of the Health Sciences (United States)
Bryan K. Ketzenberger, Uniformed Services Univ. of the Health Sciences (United States)
Margaret B. Burton, Uniformed Services Univ. of the Health Sciences (United States)
Thomas E. Johnson, Uniformed Services Univ. of the Health Sciences (United States)


Published in SPIE Proceedings Vol. 4617:
Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical
Steven L. Jacques; Donald Dean Duncan; Sean J. Kirkpatrick; Andres Kriete; Donald Dean Duncan; Sean J. Kirkpatrick; Andres Kriete, Editor(s)

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