Why is night vision green?
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Simply put when we ramp from black to red, black to green, and black to blue, and if we time each of these, we see green earlier than other colors. Meaning that our eyes are more sensitive to green wavelengths than others.
Engineers take advantage of this and use a green display on night vision goggles so that we can pick up on those very tiny changes in light intensity.
Contrary to popular belief, it has nothing to do with the number of green-sensitive receptors in our retinas. In fact red-sensitive receptors out number all others. It’s a more complex question of receptor ratio and sensitivity.
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