Accession Number : ADA117429

Title :   Laser Flash Effects: A Non-Visual Phenomenon.

Descriptive Note : Conference paper,

Corporate Author : LETTERMAN ARMY INST OF RESEARCH PRESIDIO OF SAN FRANCISCO CA

Personal Author(s) : Randolph,David I ; Schmeisser,Elmar T ; Beatrice,Edwin S

PDF Url : ADA117429

Report Date : 18 Jun 1982

Pagination or Media Count : 11

Abstract : The 20 nsec Q-switched ruby laser exposures centered on the fovea produced no immediate changes in the grating visual evoked potential for 50 and 500 micron spot sizes at two energy levels even when visible changes occurred at these sites. The findings may have been the result of the ruby laser wavelength, which was near the visual sensitivity limit of the eye, or of the single Q-switched pulse which may have occurred too quickly to produce an immediate and/or sustained change in the cortical response. The observed delayed effects and subsequent apparent recovery of the VEP may reflect the development of edema at the laser exposure site resulting in the desynchronization of the response for a period of time. This is followed by apparent recovery which was interpreted as recruitment of the spared retinal elements with subsequent neural re-entrainment at the cortical level.

Descriptors :   *Laser radiobiology, *Radiation effects, *Ruby lasers, *Laser beams, Flashes, Q switching, Vision, Recovery, Threshold effects, Contrast, Cornea, Fovea, Radiation damage, Laser damage

Subject Categories : Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE