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Dynamic Visual Acuity in Fatigued Pilots
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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Six rotary wing aviators were subjects in a continuous operation regimen involving some 12 hours of flying and 3.5 hours sleep daily for five days. Estimates of performance on a dynamic visual acuity DVA task were obtained several times each day during the study using target velocities of 25 deg. and 40 deg.sec. DVA performance varied significantly during the fatigue regimen when measurements were made with target velocities of 40 deg.sec with lower velocity targets differences in DVA scores were not significant. This indicates the need to tax the oculomotor system to demonstrate fatigue effects. Fatigue effects were partially obscured by practice effects which are considerable in the DVA task. DVA scores correlated only modestly with subjective estimates of fatigue intensity and flying performance, and IP ratings of performance, but the cluster of correlations provided a consistent picture.
APPROVED FOR PUBLIC RELEASE