MEASUREMENT OF NIGHT-VISION GOGGLE (NVG) VISUAL-ACUITY WITH THE NVG RESOLUTION CHART

Night vision goggles (NVG) operations are characterized as stressful w ith high task loading. Any reduction in goggle or visual performance w hich goes undetected can have a serious effect on flight safety and op erational capability. The NVG Test Lane, with its resolution chart, pr ovides an effective cost-efficient method for aircrew members to quick ly evaluate the correct positioning end focusing of their NVG's prior to each mission. This evaluation validated the ability of the NVG reso lution chart to produce the same performance results as a more detaile d psychophysical procedure. NVG visual acuity was measured for five su bjects (four pilots and one non-pile,) with two different night vision goggles. The results supported that there is no statistical differenc e between the results obtained with the Individual target format and t he 3 x 3 format. Additionally, the pilots with current NVG experience were able to obtain a significantly better acuity level than were thos e without current NVG experience.