Visual performance with night vision goggles (NVGs) measured in U.S. Air Force aircrew members

Carita A. DeVilbiss; William R. Ercoline; Joseph Charles Antonio

doi:10.1117/12.177386

10 June 1994 Visual performance with night vision goggles (NVGs) measured in U.S. Air Force aircrew members

Carita A. DeVilbiss, William R. Ercoline, Joseph Charles Antonio

Proceedings Volume 2218, Helmet- and Head-Mounted Displays and Symbology Design Requirements; (1994) https://doi.org/10.1117/12.177386
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Since vision is by far the most important sensory input for spatial orientation, it is important to obtain the best visual performance possible from any device. To determine whether current devices were being properly adjusted, visual performance data were obtained from USAF NVG aircrew members after they (1) adjusted the goggle using their usual method of adjustment, (2) used the NVG resolution chart to augment their usual method, and (3) used goggle-adjustment procedures learned in the training class. Results show that without a standard target or procedures, aircrew members were not able to obtain optimal goggle performance - the average visual performance was 20/53 for the 218 aviators in this study. For the 158 aviators who also used the standard target with their usual procedure, there was a significant improvement (average of 20/47). Finally, significantly better goggle performance (average of 20/37) was obtained when 48 aviators adjusted their goggles using procedures learned in the adjustment training class. While these data support the importance of preflight adjustment of NVGs, they represent visual performance under optimal, controlled conditions. It is important to remember that visual performance under actual flight conditions can be significantly impaired with reduced illumination, low contrast levels, improper cockpit lighting, and poor transmissivity of infrared energy through the transparencies.

Citation Download Citation

Carita A. DeVilbiss, William R. Ercoline, and Joseph Charles Antonio "Visual performance with night vision goggles (NVGs) measured in U.S. Air Force aircrew members", Proc. SPIE 2218, Helmet- and Head-Mounted Displays and Symbology Design Requirements, (10 June 1994); https://doi.org/10.1117/12.177386

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