what is shape of the pupil
In a new study, vision scientist Martin Banks has found that the shape of an animal’s pupils is a clue to its place in the food chain. Banks and his team looked at the eyes of 214 different species of land animals, and found a clear relationship between the shape of their pupils and their ecological role.
The pupil is the black circle in the center of the iris, which is really an opening in the iris, and it lets light enter the eye. To see how this works, use a small flashlight to see how your eyes or a friend's eyes respond to changes in brightness.