A Night-vision device, also known as Night-Vision goggles are devices invented to aid people to see in the dark. Despite the name, it doesn't have to come in the form of goggles. They featured sensitive CCD lenses and a focus button on the part near the user's ear. The way how they work is in the similar fashion as the eyes of nocturnal animals relying on sight. They use whatever visible light is available in the dark and enhance it.
A night vision device usually consists of an image intensifier tube, a protective housing, and an optional mounting system. Many NVDs also include a protective sacrificial lens, mounted over the front/objective lens to prevent damage by environmental hazards, while some incorporate telescopic lenses. An NVD image is typically monochrome green, as green was considered to be the easiest color to see for prolonged periods in the dark. Night vision devices may be passive, relying solely on ambient light, or may be active, using an Infrared illuminator.
History[]
Night-Vision devices were first invented and used nearing the end of World War 2. Those utilized during that time are known as Generation 0. More improved versions were invented during the Vietnam War in America and they were known as Generation 1. Even better versions were developed in the 1970s. Much more improved versions developed in the late 1980s.
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