Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery

G. O. Waring, M. J. Lynn, A. Nizam, M. H. Kutner, J. W. Cowden, William W Culbertson, P. R. Laibson, M. B. McDonald, J. D. Nelson, S. A. Obstbaum, J. J. Rowsey, J. J. Salz, L. B. Bourque

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Abstract

In the Prospective Evaluation of Radial Keratotomy (PERK) Study, 793 eyes of 435 patients with 2 to 8 diopters (D) of myopia received a standardized surgery consisting of 8 incisions with a diamond-bladed knife set at 100% of the thinnest paracentral ultrasonic corneal thickness measurement and a diameter of the clear zone of 3.0 to 4.5 mm; 97 eyes (12%) received an additional 8 incisions. There were 757 eyes (95%) followed for 3 to 6.3 years. After surgery, uncorrected visual acuity was 20/40 or better in 88% of eyes. The refractive error was within 1 D of emmetropia for 64% of eyes; 19% were myopic and 17% were hyperopic by more than 1 D. Between 6 months and 5 years after surgery, 22% of the eyes had a refractive change of 1 D or more in the hyperopic direction. For 25 eyes (3%) there was a loss of 2 or more lines of best spectacle-corrected visual acuity.

Original languageEnglish
Pages (from-to)1164-1176
Number of pages13
JournalOphthalmology
Volume98
Issue number8
StatePublished - Jan 1 1991

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ASJC Scopus subject areas

  • Ophthalmology

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Waring, G. O., Lynn, M. J., Nizam, A., Kutner, M. H., Cowden, J. W., Culbertson, W. W., Laibson, P. R., McDonald, M. B., Nelson, J. D., Obstbaum, S. A., Rowsey, J. J., Salz, J. J., & Bourque, L. B. (1991). Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery. Ophthalmology, 98(8), 1164-1176.