Accession Number : ADA139498


Title :   The Effects of Gx, Gy and Gz Forces on Cone Mesopic Vision


Descriptive Note : Technical rept.,


Corporate Author : AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH


Personal Author(s) : Timpton, David A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a139498.pdf


Report Date : Oct 1983


Pagination or Media Count : 59


Abstract : The effects of Gx, Gy, and Gz acceleration forces on cone-type mesopic vision threshold values are examined. An experimental has been conducted on the Dynamic Environment Simulator, a three-axis human centrifuge, to reproduce an acceleration environment in a simulated night flight combat situation. Acceleration environments studied were levels of +1Gz, +1Gy, +1Gy, +1.4Gz, +2.0Gz, +3.0Gz, +2.0Gy in combination with +1Gz. A visual task was performed which determined 20/50 visual acuity illumination threshold values. The +gz environment is known to cause profound visual symptoms at relatively high levels. Physiological parameters recorded were PaO2, by ear oximetry, heart rate, and visual acuity threshold values. Results were zero means obtained by self pairing with +1Gz controls. Analysis was done by two tailed t-test. Results showed no significant shift if luminance threshold values at +1Gy or +1.4Gz; significant increase in luminance threshold at the .05 level for +1Gx; and significant increase in luminance threshold at the .01 level for +2.0Gz, +3.0Gz, and +2.0Gy in combination with +1Gz. Results will be discussed with respect to individual variation, daily variation, wearing of glasses, cardiovascular effects, effects of head movement, and pulmonary effects.


Descriptors :   *TOLERANCES(PHYSIOLOGY) , *ACCELERATION TOLERANCE , THRESHOLD EFFECTS , PHYSIOLOGICAL EFFECTS , RETINA , LUMINANCE , BLOOD PRESSURE , VISUAL ACUITY , VISION , NIGHT VISION , HEART RATE


Subject Categories : Stress Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE