Mild hypoxia and visual performance with night vision goggles.

Image Contrast and Visual Acuity Through Night Vision Goggles

Night vision goggles (NVGs) intensify ambient illumination making it possible to see in the dark despite insufficient light for normal vision. NVGs are used for military and civilian operations, and as visual aids for night blindness. The quality and quantity of vision achieved through NVGs depends on several factors including the intensity of ambient radiation, the integrity of NVG electro-opt...

No . 94 - 17 Vernier Acuity Through Night Vision

Night vision goggles (NVG’ s) are being used increasingly in military and civilian environments. Despite the use of these devices, relatively few tests exist to assess visual performance through NVG’ s. Hyperacuity tasks may provide a sensitive index of performance through night vision devices. In this study, grating vernier acuity was measured through NVG’ s. AS reported previously, a power la...

Light Source Halos in Night Vision Goggles: Psychophysical Assessments

Anecdotal reports by pilots flying with Night Vision Goggles (NVGs) in urban environments suggest that halos produced by bright light sources impact flight performance. The current study developed a methodology to examine the impact of viewing distance on perceived halo size. This was a first step in characterizing the subtle phenomenon of halo. Observers provided absolute size estimates of hal...

An assessment of a proposed method for adjusting and focusing ANVIS night vision goggles.

Night vision goggles are becoming an increasingly important tool in military aviation. They provide superior visual capability over unaided night vision, but any reduction in goggle performance can have a serious effect on flight safety and operational effectiveness. This study shows that the use of a standard adjustment procedure in a night vision goggle (NVG) test lane, with a resolution char...

Visual Acuity and Stereopsis with Night Vision Goggles