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Proceedings Paper

Photorefractive keratectomy at 193 nm using an erodible mask
Author(s): Michael Gordon; Stephen F. Brint; Daniel S. Durrie; Theo Seiler; Marc D. Friedman; N. M. Fredrik Johnsson; Michael C. King; David F. Muller
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Paper Abstract

Clinical experience with more than ten thousand sighted eyes has demonstrated great promise for correcting myopia with photorefractive keratectomy (PRK). Previously reported techniques have incorporated computer-controlled irises, diaphragms, and apertures to regulate the desired distribution of 193 nm radiation onto the eye. This paper reports on an entirely new approach for performing PRK which utilizes an erodible mask to control the shape transfer process. Compared to the more traditional techniques, the erodible mask offers promise of correcting a broad range of refractive errors. In this paper the erodible mask and associated hardware are described in detail. We describe the shape transfer experiments used to predict the functional relationship between the desired refractive correction and the mask shape. We report on early clinical results from five patients with myopic astigmatism. We conclude that the early shape transfer experiments overestimated the spherical component of the correction by 1.25 diopters and underestimated the cylindrical component by approximately 0.85 diopters. The data suggest there may be biological effects which evoke different healing responses when myopic PRK corrections are performed with and without astigmatism. Clinical trials are proceeding with the mask shapes adjusted for these observations.

Paper Details

Date Published: 14 August 1992
PDF: 9 pages
Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); doi: 10.1117/12.137411
Show Author Affiliations
Michael Gordon, Eye Surgeons Medical Ctr. (United States)
Stephen F. Brint, Eye Surgery Ctr. of Louisiana (United States)
Daniel S. Durrie, Hunkeler Eye Clinic (United States)
Theo Seiler, Freie Univ. Augenklinik (Switzerland)
Marc D. Friedman, Summit Technology, Inc. (United States)
N. M. Fredrik Johnsson, Summit Technology Inc. (United States)
Michael C. King, Summit Technology, Inc. (United States)
David F. Muller, Summit Technology, Inc. (United States)


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

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