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Proceedings Paper

Comparison of laser phacovaporization using the Er:YAG and the Er:YSGG laser
Author(s): Raymond P. Gailitis M.D.; Scott W. Patterson; Mark A. Samuels; Kerry Brent Hagen; Qiushi Ren; George O. Waring III
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Paper Abstract

Future advances in cataract surgery aim to remove the crystalline lens through a small opening such that the capsular bag, once devoid of lens epithelial cells, may be refilled with a clear polymer which may exhibit the elastic properties of a young lens and restore accommodation. Several different lasers are currently being investigated for laser cataract surgery including the excimer, pulsed visible and short infrared, and mid infrared lasers. Taking advantage of the strong water absorption peak at 2.94 micrometers , we have investigated the laser tissue interaction of the Er:YAG (2.94 micrometers ) and Er:YSGG (2.79 micrometers ) which have water absorption coefficients of 13,000 cm-1 and 7,000 cm-1, respectively. We have devised a delivery system which measures the ablation time versus radiant energy through a known thickness on a lens nucleus in free air for these two wavelengths. The current presentation compares the ablation rates versus radiant exposure of these two lasers in human lens nuclei. We also show the histopathology from ablated lenses of these two different wavelengths at different radiant exposures. Integration with fiberoptics and clinical applications is discussed.

Paper Details

Date Published: 14 August 1992
PDF: 10 pages
Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); doi: 10.1117/12.137419
Show Author Affiliations
Raymond P. Gailitis M.D., Eye Care and Surgery Ctr. (United States)
Scott W. Patterson, Laser Atlanta Optics, Inc. (United States)
Mark A. Samuels, Laser Atlanta Optics, Inc. (United States)
Kerry Brent Hagen, Emory Univ. School of Medicine (United States)
Qiushi Ren, Univ. of Miami School of Medicine (United States)
George O. Waring III, Emory Univ. School of Medicine (United States)

Published in SPIE Proceedings Vol. 1644:
Ophthalmic Technologies II
Jean-Marie Parel, Editor(s)

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