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

Research output: Contribution to journalArticle

106 Citations (Scopus)

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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Radial Keratotomy
Visual Acuity
Emmetropia
Corneal Pachymetry
Diamond
Refractive Errors
Myopia
Ultrasonics

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Waring, G. O., Lynn, M. J., Nizam, A., Kutner, M. H., Cowden, J. W., Culbertson, W. W., ... Bourque, L. B. (1991). Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery. Ophthalmology, 98(8), 1164-1176.

Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery. / Waring, G. O.; Lynn, M. J.; Nizam, A.; Kutner, M. H.; Cowden, J. W.; Culbertson, William W; Laibson, P. R.; McDonald, M. B.; Nelson, J. D.; Obstbaum, S. A.; Rowsey, J. J.; Salz, J. J.; Bourque, L. B.

In: Ophthalmology, Vol. 98, No. 8, 01.01.1991, p. 1164-1176.

Research output: Contribution to journalArticle

Waring, GO, Lynn, MJ, Nizam, A, Kutner, MH, Cowden, JW, Culbertson, WW, Laibson, PR, McDonald, MB, Nelson, JD, Obstbaum, SA, Rowsey, JJ, Salz, JJ & Bourque, LB 1991, 'Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery', Ophthalmology, vol. 98, no. 8, pp. 1164-1176.
Waring GO, Lynn MJ, Nizam A, Kutner MH, Cowden JW, Culbertson WW et al. Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery. Ophthalmology. 1991 Jan 1;98(8):1164-1176.
Waring, G. O. ; Lynn, M. J. ; Nizam, A. ; Kutner, M. H. ; Cowden, J. W. ; Culbertson, William W ; Laibson, P. R. ; McDonald, M. B. ; Nelson, J. D. ; Obstbaum, S. A. ; Rowsey, J. J. ; Salz, J. J. ; Bourque, L. B. / Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study five years after surgery. In: Ophthalmology. 1991 ; Vol. 98, No. 8. pp. 1164-1176.
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