Night vision works by collecting the small amounts of light that are still available even in the darkest of rooms there is always some kind of light available which night vision equipment takes and enhances giving some more ability to see everything in the room. The scientific wording of night vision is taking light on lowest end of the light spectrum and enhances those light particles to take them into the higher end of the light spectrum making them more visible to the human eye to use them to illuminate the room or surrounding area. Writen by Undisposable.

Some animals, such as cats, dogs, and deer have a structure called tapetum lucidum in the back of the eye that reflects light back towards the retina, increasing the amount of light it captures. In humans, only 10% of the light that enters the eye falls on photosensitive parts of the retina. An animal's ability to see in low light levels may be similar to what humans see when using first or perhaps second generation image intensifiers.