Nowadays SBG Labs produces head-up displays based on their switchable waveguide technology for the United States Army and the People's Liberation Army.
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This is the distance at which, given the average human eye rangefinder "baseline" (distance between the eyes or Inter-Pupillary Distance (IPD)) of between 2.5 and 3 inches (6 and 8 cm), the angle of an object at that distance becomes essentially the same from each eye.
Head-mounted display, a display to have video displayed in front of the eyes, often using LCD technology