Superman can use his X-ray vision whenever the need arises. It turns out that in real life, some fish and amphibians can do something nearly as super when it come to their sight.
Researchers on Thursday said these animals, when navigating murky freshwater environments like rivers and streams, can turn on an enzyme in their eyes that supercharges their ability to see infrared light, sharpening their vision in the muck and mire.
The enzyme, called Cyp27c1, is related to vitamin A, which was already known to promote good vision, particularly in low light.