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Night vision devices can be damaged by different reasons. Use of these devices in bright night is the main reason. Long exposure to light shortens the life-span of night vision devices. To prevent it, all night vision devices have a cut-off circuit when over exposed.
Except bright light, the factors like rain, fog and extremely high humidity may damage night vision devices. As night vision devices are used at night, they are more likely to expose to dampness or high humidity condition.
Night Vision devices have delicate vacuum intensifier tubes that are sensitive to impact and should be handled carefully. Clean lenses the same way you would your camera. The lenses are optically coated and may be scratch if abrasive material is used or if dirt is rubbed into the glass. Usually there is no need to remove the lenses and clean inside. Storage for long periods is best in a cool dry place with the batteries removed.
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