Laser-induced stress-wave propagation in the eye

Roberto Pini; Salvatore Siano; Renzo Salimbeni; Pier Giorgio Gobbi

doi:10.1117/12.350012

14 June 1999 Laser-induced stress-wave propagation in the eye

Roberto Pini, Salvatore Siano, Renzo Salimbeni, Pier Giorgio Gobbi

Proceedings Volume 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical; (1999) https://doi.org/10.1117/12.350012
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

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.

Citation Download Citation

Roberto Pini, Salvatore Siano, Renzo Salimbeni, and Pier Giorgio Gobbi "Laser-induced stress-wave propagation in the eye", Proc. SPIE 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical, (14 June 1999); https://doi.org/10.1117/12.350012

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