THE STEREOSCOPIC ANGLE AND ITS RELATIONSHIP TO THE STANDARD AIR FORCE TESTS FOR DEPTH PERCEPTION
Rept. for 1 Nov 1965-15 Apr 1966
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
Pagination or Media Count:
The three standard Air Force depth perception tests for pilot and observer qualification are the Vision Test Apparatus--Near and Distant VTA-ND, Verhoeff Stereopter DPA-V, and Howard-Dolman apparatus H-D. The stereoscopic angle for the VTA-ND is 25 seconds of arc, 32 seconds for the DPA- V, and 11 seconds for the H-D. An enlarged Verhoeff SAM-V was utilized at equivalent calculated distances to compare with the three instruments under their individual parallactic angle conditions. Data analysis showed the following 1 Employment of the standard criteria for flying qualification resulted in the Verhoeff passing the greatest number, followed by the VTA-ND, and the H-D. Neither the Verhoeff nor H-D results statistically differed from those of the VTA-ND. 2 The SAM-V generally passed fewer subjects than the corresponding standard tests. The results found with the standard Air Force tests are not a full measure of depth discrimination capability. A test concept is described which would incorporate a dynamic component into depth judgments.
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