Share Email Print
cover

Proceedings Paper

AH-64 IHADSS aviator vision experiences in Operation Iraqi Freedom
Author(s): Keith L Hiatt; Clarence E. Rash; Eric S. Harris; William H. McGilberry
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Forty AH-64 Apache aviators representing a total of 8564 flight hours and 2260 combat hours during Operation Iraqi Freedom and its aftermath were surveyed for their visual experiences with the AH-64's monocular Integrated Helmet and Display Sighting System (IHADSS) helmet-mounted display in a combat environment. A major objective of this study was to determine if the frequencies of reports of visual complaints and illusions reported in the previous studies, addressing mostly benign training environments, differ in the more stressful combat environments. The most frequently reported visual complaints, both while and after flying, were visual discomfort and headache, which is consistent with previous studies. Frequencies of complaints after flying in the current study were numerically lower for all complaint types, but differences from previous studies are statistically significant only for visual discomfort and disorientation (vertigo). With the exception of "brownout/whiteout," reports of degraded visual cues in the current study were numerically lower for all types, but statistically significant only for impaired depth perception, decreased field of view, and inadvertent instrumental meteorological conditions. This study also found statistically lower reports of all static and dynamic illusions (with one exception, disorientation). This important finding is attributed to the generally flat and featureless geography present in a large portion of the Iraqi theater and to the shift in the way that the aviators use the two disparate visual inputs presented by the IHADSS monocular design (i.e., greater use of both eyes as opposed to concentrating primarily on display imagery).

Paper Details

Date Published: 8 September 2004
PDF: 16 pages
Proc. SPIE 5442, Helmet- and Head-Mounted Displays IX: Technologies and Applications, (8 September 2004); doi: 10.1117/12.541385
Show Author Affiliations
Keith L Hiatt, Southeast Regional Medical Command (United States)
Clarence E. Rash, U.S. Army Aeromedical Research Lab. (United States)
Eric S. Harris, U.S. Army Aeromedical Research Lab. (United States)
William H. McGilberry, U.S. Army Aeromedical Research Lab. (United States)


Published in SPIE Proceedings Vol. 5442:
Helmet- and Head-Mounted Displays IX: Technologies and Applications
Clarence E. Rash; Colin E. Reese, Editor(s)

© SPIE. Terms of Use
Back to Top