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Infrared radiation is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected.
Though image intensification technology employed by different manufacturers varies, from the tactical point of view a night vision system is an optical device that enables vision at low light.cientists at the University of Michigan have developed a contact lens that can act as night vision device. The lens has a thin strip of graphene between layers of glass that reacts to photons to make dark images look brighter.