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Hi,
Night vision technology is absolutely harmless, it doesn't emit radiation nor will it blind you if a bright light hits it while in use. Most likely it will damage the device. Night vision is no more dangerous or harmful than watching TV. Diode (LED) based IR Illuminators are also harmless. Laser based illuminators on the other hand, CAN be harmful to your eyes. If you have a laser based IR use it with caution. Laser based IRs seldom appear on the consumer market.
Thus it is true that night vision devices require little light to be present, it is possible to use them in complete darkness with help of IR Illuminator. Since most of the time you encounter complete darkness in enclosed environments, high magnification power is not a necessity, you'd rather be able to see at a very close range. In this case the most effective viewing device is a goggle. Most goggles have magnification power of 1, built-in IR Illuminator, close focus and a viewing range of a few hundred feet.
The viewing distance depends on the area, conditions and a size of your target. It varies anywhere from 300 to 1500 feet. Overcast conditions, fog, rain and snow will significantly reduce the effective viewing range. On the other hand your viewing range will increase dramatically under clear skies and/or full moon. Light reflective surfaces such as snow or sand will also increase the effective viewing range of your night vision device. Infrared illuminator (IR) may help, especially in enclosed environments.
Thanks
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