Corneal injury from 1318-nm single laser pulses

William P. Roach; Bryan K. Ketzenberger; Margaret B. Burton; Thomas E. Johnson

doi:10.1117/12.472542

27 June 2002 Corneal injury from 1318-nm single laser pulses

William P. Roach, Bryan K. Ketzenberger, Margaret B. Burton, Thomas E. Johnson

Proceedings Volume 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical; (2002) https://doi.org/10.1117/12.472542
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

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.

Citation Download Citation

William P. Roach, Bryan K. Ketzenberger, Margaret B. Burton, and Thomas E. Johnson "Corneal injury from 1318-nm single laser pulses", Proc. SPIE 4617, Laser Tissue Interaction XIII: Photochemical, Photothermal, and Photomechanical, (27 June 2002); https://doi.org/10.1117/12.472542

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