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Proceedings Paper

Laser-induced stress-wave propagation in the eye
Author(s): Roberto Pini; Salvatore Siano; Renzo Salimbeni; Pier Giorgio Gobbi
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Paper Abstract

The behavior of stress waves induced by Argon-Fluoride laser ablation of the cornea in the typical operative conditions of clinical laser keratectomy have been studied experimentally and analyzed in porcine eyes and in an artificial eye model. Laser-induced stresses with pressure peaks as high as 100 bar were measured in the anterior chamber of irradiated eyes. Analysis of stress wave propagation the eye evidenced diffraction effects modifying the temporal shape of the stress transient with the formation of a rarefaction phase. Besides, significant pressure enhancements caused by focusing of the stress wave front were observed to occur when the spot diameter exceeded 3 mm. For the maximum laser spot diameter of 6.5 mm, diffraction and focusing effects produced at the acoustic focus in the eye compression peaks of 250 and negative peaks of -90 bar, respectively. Implications to clinical procedures, as possible damages due to tissue stretching and cavitation formation are discussed.

Paper Details

Date Published: 14 June 1999
PDF: 7 pages
Proc. SPIE 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical, (14 June 1999); doi: 10.1117/12.350012
Show Author Affiliations
Roberto Pini, Istituto Elettronica Quantistica (Italy)
Salvatore Siano, Istituto Elettronica Quantistica (Italy)
Renzo Salimbeni, Istituto Elettronica Quantistica (Italy)
Pier Giorgio Gobbi, San Raffaele Hospital Milan (Italy)

Published in SPIE Proceedings Vol. 3601:
Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical
Steven L. Jacques; David H. Sliney; Gerhard J. Mueller; Gerhard J. Mueller; Andre Roggan; Andre Roggan; David H. Sliney, Editor(s)

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