Excuse me, what is the reason why one of my pupils is black and the other is dark brown?

About 1/6 of human eyeball is exposed to air. We usually call them white eyes and eyeballs. The scientific name of supercilious look is sclera, which is white, so the different colors of eyes are mainly displayed on the eyeball, which is located in the middle and front of the eyeball and consists of cornea, iris and pupil.

Because the cornea is colorless and transparent, the color of the eyeball mainly comes from the iris, which is a disc-shaped membrane extending from the ciliary muscle to the front of the lens.