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Night vision is the ability to see in low light conditions. Humans have poor night vision compared to many animals, in part because the human eye lacks a tapetum lacidum. Night glasses are telescopes or binoculars with a large diameter objective. Large lenses can gather and concentrate light, thus intensifying light with purely optical means and enabling the user to see better in the dark than with the naked eye alone. Night vision binoculars are most often used by the military and law enforcement agencies, but are available to civilian users. First generation night vision goggles, introduced during the Vietnam War, were an adaptation of earlier active GEN 0 technologies, and rely on ambient light instead of an infrared light source. Using an S-20 photocathode, their image intensifiers produce a light amplification of around 1000 X, but are quite bulky and require moonlight to function properly. For the spy in all of us, armyuniverse provides you with a variety of GEN 1 night vision goggles.