Photorefractive keratectomy at 193 nm using an erodible mask

Michael Gordon M.D.; Stephen F. Brint M.D.; Daniel S. Durrie M.D.; Theo Seiler; Marc D. Friedman; N. M. Fredrik Johnsson; Michael C. King; David F. Muller

doi:10.1117/12.137411

14 August 1992 Photorefractive keratectomy at 193 nm using an erodible mask

Michael Gordon M.D., Stephen F. Brint M.D., Daniel S. Durrie M.D., Theo Seiler, Marc D. Friedman, N. M. Fredrik Johnsson, Michael C. King, David F. Muller

Author Affiliations +

Proceedings Volume 1644, Ophthalmic Technologies II; (1992) https://doi.org/10.1117/12.137411
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

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Michael Gordon M.D., Stephen F. Brint M.D., Daniel S. Durrie M.D., Theo Seiler, Marc D. Friedman, N. M. Fredrik Johnsson, Michael C. King, and David F. Muller "Photorefractive keratectomy at 193 nm using an erodible mask", Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); https://doi.org/10.1117/12.137411

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