The eyes are the mirror of the soul

Have you ever asked at yourself, why human eyes are like they are? I mean, around the world the eyes of the animals are dark, for example , if you look at the eyes of your dog you can see their iris. It is the dark part of the eye. In general this only occurs in the animals, in humans it is different. When you look at your eyes at yourself in a mirror you can identify the iris and the sclera. The sclera is the white part of the eye, it surrounds the iris. Likewise it is possible that some chimpanzees and gorillas have this peculiarity, although it's rare.

Why is this so? Anthropologists think that at the origins of Humanity before that our ancestors start to speak, the nonverbal communication had an important role. For this reason the possibility to exchange information between the members of a group without words become essential. They could communicate with their hands, sounds and gestures. If the eyes were completely dark they couldn't identify the message but if the eyes were only dark in the middle they could catch a signal without words or sound. Anyway it is a theory.

Thanks! have a nice day.