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However, since active infrared light can be detected by night-vision goggles, there can be a risk of giving away position in tactical military operations. Laser range gated imaging is another form of active night vision which utilizes a high powered pulsed light source for illumination and imaging.
From 1972 until 1990 the AN/PVS-5 was the mainstay in US Army night vision for aviation. The AN/PVS-5C was not approved for flight because of its high-light cut off feature causing the goggle to shut off in bright light. For ground troops the AN/PVS-5 was the sole night-vision goggle until the adaptation of the improved AN/PVS-7.
Goggles come in two styles, eyecup goggles, and cover goggles. Eyecup goggles completely cover the eye socket to give all-round protection. They have adjustable or elasticized headbands and often are equipped with ventilation ports to allow air in and prevent fogging. For example, swimming goggles to protect the eyes from salt or chlorine.
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The goggles fit tightly against the face so that the only light entering is through the slits, and soot is sometimes applied to the inside to help cut down on glare. [2] [5] [6] The slits are made narrow not only to reduce the amount of light entering but also to improve the visual acuity. [2] Wider slits result in a larger field of view. [2]