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September 1969

The Retinal Pigment EpitheliumRadiation Thresholds Associated With the Q-switched Ruby Laser

Author Affiliations

USA; USA; Ky; Boston
From the Biophysics Division, US Army Medical Research Laboratory, Fort Knox, Ky (CPT Leibowitz and CPT Peacock), and the Department of Ophthalmology, Boston University School of Medicine, Boston (Dr. Friedman). Dr. Leibowitz is now with the Department of Ophthalmology, Boston University School of Medicine, Boston, and Mr. Peacock is with Industrial Magnetics, Inc., Canton, Mass.

Arch Ophthalmol. 1969;82(3):332-338. doi:10.1001/archopht.1969.00990020334007

The macula lutea of anesthetized Rhesus monkeys were exposed to graded amounts of light emitted by a Q-switched ruby laser in order to determine the radiation threshold for retinal injury. The eyes were studied ophthalmoscopically and by means of flat preparations of the retinal pigment epithelium. Ophthalmoscopically visible lesions were observed at retinal energy densities of 0.07 joule (J)/sq cm and over. Histologic lesions of the retinal pigment epithelium were noted at retinal energy density levels as low as 0.01 J/sq cm.