Night Vision Goggle Field-Expedient Visual Acuity Adjustment Procedures: Initial Experiment.
Final rept. Jul-Dec 95,
ARMY RESEARCH INST FOR THE BEHAVIORAL AND SOCIAL SCIENCES ALEXANDRIA VA
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The third-generation image intensification technology in night vision goggles NVGs used by ground forces provides at best 2040 or 2045 visual acuity. These acuity levels cannot be achieved unless soldiers adjust their NVGs properly. Documentation available to soldiers does not address optimum adjustment techniques developed by the aviation community nor does it address what can be used in the field to achieve a good setting. We examined the effectiveness and utility of 15 different objects commonly available to soldiers to determine which provided the best visual acuity readings with the ANPVS-713 NVGs. After training and practice acuity improved by 25 over the baseline assessment. No large differences in readings occurred among the objects. However, a more definitive picture emerged when the average readings were combined with measures of variability and soldier preferences. The initial recommendation is to use one of the following objects for NVG adjustment trec trunk, vehicle, vehicle trail, stars, blue chem light, or an infrared chem light. Not recommended are bright andor red light sources, white paper, and trees silhouetted against the night sky. Problems in assessing acuity with NVGs are also discussed
- Anatomy and Physiology
- Optical Detection and Detectors