Bibliographic Citation
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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 Date | 1985 May 01 |
OSTI Identifier | OSTI ID: 5940678 |
Report Number(s) | AD-A-163191/0/XAB |
Resource Type | Technical Report |
Research Org | Technology, Inc., San Antonio, TX (USA). Life Sciences Div. |
Subject | 560400 -- Other Environmental Pollutant Effects; RETINA-- BIOLOGICAL RADIATION EFFECTS; ELECTRODES;ELECTROPHYSIOLOGY;ENERGY LEVELS;EXPANSION;LASERS;LOSSES;RECOVERY;SPATIAL DISTRIBUTION;TRANSIENTS;VISION |
Related Subject | BIOLOGICAL 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 Publication | United States |
Language | English |
Format | Pages: 15 |
Availability | NTIS, PC A02/MF A01. |
System Entry Date | 2001 May 13 |
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