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May 1987

The UCLA and PERK Studies

Author Affiliations

Santa Monica, Calif

Arch Ophthalmol. 1987;105(5):610. doi:10.1001/archopht.1987.01060050028006

To the Editor.  —At UCLA, we began the first controlled and monitored prospective study of radial keratotomy in the United States. Our original article,1 published in Ophthalmology in 1981, reported the results of the first 52 eyes undergoing 16-incision, metal-blade radial keratotomy. Our results were analyzed by a biostatistician at American Medical Optics. Many important negative correlations were noted but not emphasized in the article. "Statistical analysis revealed that the change in myopia, uncorrected acuity, or corneal flattening did not correlate with the steepness of the cornea, axial length, corneal diameter, perforation, scleral rigidity, intraocular pressure, age or pachymetry [italics added]." This aspect of our results was discussed little in the ensuing years.However, it is very satisfying for me to note the recent article by Lynn and colleagues2 of the PERK Study Group. They report confirmation of our work: "We found little relationship between the average keratometric

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