this post was submitted on 24 Sep 2023
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Night vision goggles usually are very sensitive to visible light yeah. Im not sure on exactly how the optics work but some modern ones are set up more like vr. Some are also sensitive to near infra red, and some see entirely in infra red. The latter are thermal imaging. The longer the wavelength you go (the more red) the more difficult it is to create sensors that receive a good image. You can imagine that putting a thermal eye in a warm blooded animal might be a bit difficult because the eye itself will be emitting light that overpowers the scene.