Threshold data for retinal lesions in man exposed to short flashes (135 ms) of intense white light were obtained. Retinal image diameter of the light beam was approximately 1.4 mm. Visual performance tests employed before and after exposure are discussed. The data are compared with those obtained from animal experimentation (rabbits and Rhesus monkeys). Energy levels required to elicit ophthalmoscopically-visible minimal lesions in the human eye ranged between 4.9-15.7 J/cm2 depending upon fundus pigmentation. In one case 13.0 J/cm2 applied to the macula directly caused only minimal temporary visual acuity loss, but no visible lesion. The data compare to 5.54 to 7.6 J/cm2 for lesions in monkey retinae, and 4.06 to 4.14 J/cm2 in rabbit eyes.
*Submitted November 15, 1972 for publication in the May, 1973 issue of the American Journal of Optometry and Archives of American Academy of Optometry.
These investigations were supported in part by the Surgeon General's Office, U.S. Army Medical Research and Development Command, Washington, D.C. Contract #DA 49-193- MD-2241, Defense Atomic Support Agency (DASA), Contract #DA 49-146-XZ-416 and National Eye Institute (NIH) grant #T01-EY00022.
†Ophthalmologist, M.D., Member of Faculty.
aOptometrist, Ph.D., Member of Faculty.
© 1973 American Academy of Optometry