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; W. Culbertson; P. R. Laibson; M. B. McDonald; J. D. Nelson; S. A. Obstbaum; J. J. Rowsey; J. J. Salz; L. B. Bourque

doi:10.1016/S0161-6420(91)32156-0

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, W. Culbertson, P. R. Laibson, M. B. McDonald, J. D. Nelson, S. A. Obstbaum, J. J. Rowsey, J. J. Salz, L. B. Bourque

Ophthalmology & Visual Neurosciences

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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 language	English (US)
Pages (from-to)	1164-1176
Number of pages	13
Journal	Ophthalmology
Volume	98
Issue number	8
DOIs	https://doi.org/10.1016/S0161-6420(91)32156-0
State	Published - 1991

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Waring, G. O., Lynn, M. J., Nizam, A., Kutner, M. H., Cowden, J. W., Culbertson, 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. https://doi.org/10.1016/S0161-6420(91)32156-0

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title = "Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study Five Years after Surgery",

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.",

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

year = "1991",

doi = "10.1016/S0161-6420(91)32156-0",

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AU - Kutner, M. H.

AU - Cowden, J. W.

AU - Culbertson, W.

AU - Laibson, P. R.

AU - McDonald, M. B.

AU - Nelson, J. D.

AU - Obstbaum, S. A.

AU - Rowsey, J. J.

AU - Salz, J. J.

AU - Bourque, L. B.

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AB - 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.

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Results of the Prospective Evaluation of Radial Keratotomy (PERK) Study Five Years after Surgery

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