There are two types of night vision goggles, one is low-light night vision goggles, and the other is infrared night vision goggles. the
Low-light night vision goggles magnify weak light, while infrared night vision goggles convert infrared rays into visible light. the
Infrared night vision goggles are divided into two types, one is active and the other is passive. The active type is that the night vision goggles emit a beam of infrared rays, shine on the object and then reflect back, which is equivalent to a flashlight; the passive type is Amplify and convert the infrared rays emitted by the object itself into visible light. the
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Therefore, in the absence of light at all, low-light night vision goggles cannot see things. If there is no infrared source (most things that generate heat can be infrared sources, such as living things, vehicles, flames, etc.), passive infrared night vision goggles can't see anything. the
And active infrared night vision goggles can see things in any situation. Different night vision goggles have different applicable occasions, and the low-light night vision goggles are suitable for use when there is starlight or moonlight in the wild. the
Since night vision goggles only show monochrome, and its display is green (you can notice that many gauges have green displays), you are seeing green.