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Laser In Situ Keratomileusis Versus Photorefractive Keratectomy in the Correction of Myopic Astigmatism

Fraunfelder, Frederick W. M.D.; Wilson, Steven E. M.D.

Clinical Sciences

Purpose. To evaluate retrospectively the effectiveness of astigmatism correction in eyes treated with laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK).

Methods. Patients with low to moderate myopia with astigmatism ranging from +0.25 to +4.50 diopters were included in the study. PRK was performed on 62 eyes and LASIK on 70 eyes. Six-month data were analyzed with regard to astigmatism power, astigmatism axis, spherical equivalent, uncorrected visual acuity, vector astigmatism change, and topographic corneal regularity.

Results. Mean astigmatism magnitude change was 0.54 ± 0.76 in PRK-treated eyes and 0.60 ± 0.67 in LASIK-treated eyes (61% versus 64% change, respectively, p = 0.61) at 6 months after surgery. Mean spherical correction change was −2.79 ± 1.51 for PRK and −2.90 ± 1.03 for LASIK (p = 0.63). Mean spherical equivalent change was −2.5 ± 1.57 for PRK and −2.6 ± 1.23 for LASIK (p = 0.73). Mean change in astigmatism axis was 20.8 ± 73.1 for PRK and 33.8 ± 81.7 for LASIK (p = 0.34). Mean change in uncorrected visual acuity (LogMar) was 0.84 ± 0.26 for PRK and 0.89 ± 0.23 for LASIK (p = 0.21). Mean vector-corrected astigmatism change was 0.88 ± 0.66 for PRK and 0.95 ± 0.59 for LASIK (p = 0.51). Mean vector-corrected astigmatism axis for PRK was 86.9 ± 59° and for LASIK 83.8 ± −47.6° (p = 0.75).

Conclusion. There was no significant difference in astigmatism correction between PRK and LASIK at 6 months after surgery.

From the Department of Ophthalmology, University of Washington School of Medicine, Seattle, Washington, U.S.A.

Submitted October 16, 2000.

Revision received January 9, 2001.

Accepted January 10, 2001.

Supported in part by U.S. Public Health Service grant EY10056 from the National Eye Institute, and an unrestricted grant from Research to Prevent Blindness, Inc., New York, NY.

Proprietary interest: None.

Address correspondence and reprint requests to Dr. S.E. Wilson, Department of Ophthalmology, University of Washington School of Medicine, Box 356485, Seattle, WA 98195-6485, U.S.A.

© 2001 Lippincott Williams & Wilkins, Inc.