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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
10
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pubmed:dateCreated |
1988-1-6
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pubmed:abstractText |
The Prospective Evaluation of Radial Keratotomy (PERK) study is a nine-center clinical trial of a standardized technique of radial keratotomy in 435 patients who had simple myopia with a preoperative refractive error between -2.00 and -8.00 diopters (D). The authors report results for one eye of each patient. The surgical technique consisted of eight incisions using a diamond micrometer knife with the blade length determined by intraoperative ultrasonic pachymetry and the diameter of the central clear zone determined by the preoperative refractive error. At 3 years after surgery, 58% of eyes had refractive error within 1.00 D of emmetropia; 26% were undercorrected and 16% were overcorrected by more than 1.00 D. Uncorrected visual acuity was 20/40 or better in 76% of eyes. The operation was more effective in eyes with a preoperative refractive error between -2.00 and -4.37 D. Between 1 and 3 years after surgery, the refractive error changed by 1.00 D or more in 12% of eyes, indicating a lack of stability in some eyes. In the 435 eyes, there was a small number of complications including six eyes that lost two or three lines of best-corrected acuity, 16 that experienced vascularization of the incisions, 2 that had delayed bacterial keratitis, and 4 that had recurrent epithelial erosions.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0161-6420
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
94
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1339-54
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pubmed:dateRevised |
2007-11-14
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pubmed:meshHeading |
pubmed-meshheading:3684210-Follow-Up Studies,
pubmed-meshheading:3684210-Humans,
pubmed-meshheading:3684210-Keratotomy, Radial,
pubmed-meshheading:3684210-Myopia,
pubmed-meshheading:3684210-Postoperative Complications,
pubmed-meshheading:3684210-Refraction, Ocular,
pubmed-meshheading:3684210-Visual Acuity
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pubmed:year |
1987
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pubmed:articleTitle |
Three-year results of the Prospective Evaluation of Radial Keratotomy (PERK) Study.
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pubmed:affiliation |
PERK Coordinating Centers, Emory University, Atlanta, GA 30322.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
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