Visual Perception through Windscreens: Effects of Minor Occlusions and Haze on Operator Performance,
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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Current specifications and acceptance procedures regarding the size and number of minor defects optical occlusions permitted on aircraft transparencies reflect a marked lack of uniformity--size requirement ranging from 0.035 to 0.25 inch and numbers allowed varying from 1 per square foot to 20 per zone. Additionally, there is, at the present time, no objective means for determining when a transparency should be replaced due to the amount of halation found in it. To address these two problems, two experiments were devised and performed in the Windscreen Facility of the Air Force Aerospace Medical Research Laboratory. The first study sought to determine the effects of size and number density per unit area of minor optical defects contained in an aircraft transparency on the performance of a simulated air-to-air target acquisition task while the second sought to determine what relationship, if any, existed between the amount of haze emanating from a transparency and the amount of an observers field-of-view FOV or visual field that is lost rendered unusable due to the presence of the haze.