title: A human performance/workload evaluation of the AN/PVS-5 bifocal night vision goggles.
abstract: Eight experienced U.S. Army aviators performed various maneuvers in an instrumented helicopter to test the relative usability of two bifocal-configured night vision goggles. Both configurations were statistically better than the unmodified arrangement when looking at a pilot's ability to fly a standard traffic pattern and to hold a precise altitude at night. The subjective data, supported by comparative flight performances with the two bifocals, further suggested that a 24% bifocal version was more desirable than a 14% configuration. The inference is that the reduced inside field of view presented by the 14% bifocal interferes with a pilot's ability to readily locate instruments once he has directed his attention inside the cockpit.
mesh_terms: D000337:Aerospace Medicine; D005069:Evaluation Studies as Topic; D005139:Eyeglasses; D006801:Humans; D013647:Task Performance and Analysis; D014785:Vision, Ocular