Abstract
Before performing an airborne mission that uses night vision goggles (NVGs) , aircrew must properly set the NVGOs various adjustments: interpupillary distance, tilt, eye relief, height, eyepiece and objective lens focus. Currently, aircrew use a Hoffman 20/20 test unit to pre-focus their NVG objective lenses at optical infinity before boarding their aircraft. They may also refocus their objective lenses while in the cockpit and during the course of the mission. This paper examines observersO abilities to resolve targets of different sizes, viewed through NVGs, as a function of different pre-focused distances corresponding to focusing errors.
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