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Title Visual evoked potential correlates of laser flashblindness in rhesus monkeys. I. Argon laser flashes
Creator/Author Previc, F.H. ; Blankenstein, M.F. ; Garcia, P.V. ; Allen, R.G.
Publication Date1985 May 01
OSTI IdentifierOSTI ID: 5940678
Report Number(s)AD-A-163191/0/XAB
Resource TypeTechnical Report
Research OrgTechnology, Inc., San Antonio, TX (USA). Life Sciences Div.
Subject560400 -- Other Environmental Pollutant Effects; RETINA-- BIOLOGICAL RADIATION EFFECTS; ELECTRODES;ELECTROPHYSIOLOGY;ENERGY LEVELS;EXPANSION;LASERS;LOSSES;RECOVERY;SPATIAL DISTRIBUTION;TRANSIENTS;VISION
Related SubjectBIOLOGICAL EFFECTS;BODY;BODY AREAS;DISTRIBUTION;EYES;FACE;HEAD;ORGANS;PHYSIOLOGY;RADIATION EFFECTS;SENSE ORGANS
Description/Abstract The visual evoked potential (VEP) in three rhesus monkeys was used to assess the transient loss of visual function resulting from single 100-msec argon laser flashes (514.5 nm), at energy levels well below the Maximum Permissible Exposure (MPE).^VEPs were elicited by high-contrast squarewave test gratings phase reversed at a frequency of 6 Hz, and were recorded using bipolar electrodes implanted in the foveal projection region of area 17.^The parameters which were investigated included: (a) flash size (focused vs. expanded); (b) position of the electrode`s receptive field relative to the position of the flash (0, 1.5, 3.0 and 4.5/sup 0/ separation); (c) flash exposure level (50, 5 and 0.5 % of the MPE); (d) peak wavelength of the test grating (454, 540 and 630 nm); and (e) spatial frequency of the test grating (1.0, 4.0, 6.0 and 12.0 c/deg).^The results of the flash size experiment revealed that the expanded flash (retinal diameter approx.^700 micrometers) eliminated or severely attenuated the VEP for a longer duration than did the focused flash, and also resulted in more gradual recovery function.^In general, the findings suggest that the focused and expanded Argon laser flashes produce a VEP suppression whose time-course and other characteristics correlate highly with those associated with the flashblindness observed behaviorally in humans following exposure to intense noncoherent flashes.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 15
AvailabilityNTIS, PC A02/MF A01.
System Entry Date2001 May 13

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