The Effects of Gx, Gy and Gz Forces on Cone Mesopic Vision
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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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 2050 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.
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