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Perry S. Binder, MD

JAMA. 1990;263(8):1127.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

When radial keratotomy was introduced into the United States, the procedure was performed using razor blade fragments whose extension was determined by sighting on a linear scale block; up to 24 or more incisions of various length per eye were used. As with any new procedure, significant complications occurred. The technique was declared "a risky procedure of unproven long-term success."¹ The Prospective Evaluation of Radial Keratotomy (PERK) Study was begun in March 1982 as a nine-center trial with 10 participating surgeons that was designed to determine the outcome of a single standardized technique for simple (no astigmatism) myopia.² About the time the PERK Study began, current surgical procedures were just being applied by the majority of radial keratotomy surgeons (diamond blades, ultrasonic measurement of corneal thickness, reduction of the length and number of incisions to 16).³ In this issue of THE JOURNAL, Waring and coworkers⁴ provide . . . [Full Text PDF of this Article]

Author Affiliations
From the Ophthalmology Research Laboratory, Sharp Cabrillo Hospital; the Department of Ophthalmology, University of California—San Diego; and the National Vision Research Institute, San Diego, Calif.

Footnotes
Reprint requests to 9834 Genesee Ave, Suite 200, La Jolla, CA 92037 (Dr Binder).

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