I watched Kyle's Because Science video on The Predator and 1 thing he talked about was IR vision. Here was his argument:
If you can see nothing but infrared light, you can only see the ambient temperature and thus you couldn't see anything.
I would argue strongly against that simply because not all things react to heat in the same way or to the same extent.
1 simple way to disprove his argument would be to have a set of materials that each react differently to heat such as these:
Glass: Traps heat
Body of human or animal: Emits heat
Water: High heat capacity
Make sure they are at exactly the same temperature and then see them in infrared. You would clearly see differences in what appears to be temperature.
The metal would appear to at least be several hundred degrees if not thousands of degrees. The glass would also appear very hot but not as hot as metal. The body would appear to be at the temperature it actually is at. The water would appear to be significantly colder(it might look as cold as ice even if it isn't that cold). The plastic would appear to be only slightly colder than the body. You wouldn't be seeing the temperature but rather the reaction to heat.
Another easy way to test would be to look at the body of a human or a creature at its starting position, and then continue looking at that same position as the creature or human moves while at the same time not sensing movement with any other senses. You would see a faint heat signature that dissipates within milliseconds and the colder it is, the faster the heat signature dissipates. In other words, even if you couldn't tell the exact shape of the creature or human, you could still tell that it moved by seeing a faint heat signature.
Thus I do believe that Kyle is wrong.
You could sense the movement of an object or how it reacts to heat, not just the ambient temperature. Yes, you could tell just from looking outside whether it is 40 degrees or 80 degrees. But you could also tell how an object reacts to a change in temperature or if an object has moved. Nothing would get past you since there is no object that doesn't emit heat. Even black holes emit a small amount of heat. Yes, even cold blooded creatures like lizards that would blend into their environment as far as temperature, you could still see.
In other words, unless your eyes were injured, got cataracts, or are effected by genetics, you would never go blind until you die. You wouldn't even be night blind. Even in a jungle at night during a new moon, you could still see everything around you. You would even be able to see your own abdominal and chest organs. You could see if you are pregnant or gravid long before you actually look bigger. You could see if something was inflamed and what it is before you get any symptoms.
But am I right that you could see anything with infrared vision including black holes and cold blooded creatures and that night blindness would simply be impossible without something directly effecting your eyes?