Can any human being have ultra violet vision?

In a manner of speaking, we all can see infrared photons. While most of us are limited to the visible spectrum, people with a condition called aphakia possess ultraviolet vision. Aphakia is the lack of a lens, due to surgical removal for cataracts or congenital defects. read more

Either damage to the eye's lens or a genetic abnormality called congenital primary aphakia. The lens is what absorbs electromagnetic radiation in the ultraviolet region (300-400 nanometres). read more

Humans are trichromats; we have three types of cone structures in our eyes. In the picture above, we would see the upper flower — a bird, we think, sees the lower. Interestingly, there’s a chance that some humans are tetrachromats. read more