U.S. military researchers are asking industry to develop night-vision devices far smaller and lighter in weight than today's night-vision goggles; the new devices would be about the same size and weight as a typical pair of eyeglasses. Officials of the U.S. Defense Advanced Research Projects Agency (DARPA) in Arlington, Va., issued a broad agency announcement (HR001121S0013) in January for the Enhanced Night Vision in eyeglass form factors (ENVision) project. Today's night-vision goggles typically are as bulky as four inches long and as heavy as 2.2 pounds. This causes a large torque on the wearer's neck, which limits the wearer's agility and often leads to chronic injury over prolonged use of these electro-optical devices.
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