Just admit it, goat eyes look weird! It's the pupils, mostly, but goats can also do things with their eyes that humans just can't. A study out of the University of California, Berkeley looked at a ...

For years, scientists thought that pupils â those tiny black circles in the middle of our eyes â dilate and become large when we inhale and constrict to their smallest size when we exhale.

The condition may also be present from birth. Pupils, or the black parts at the center of the eyes, change size to regulate the amount of light entering the eye. Pupils are large in the dark to ...

ETH Zurich researchers found that pupil size changes during sleep, indicating shifts in brain activity. This could help ...

Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more widely in low light. So, at the outset, nocturnal eyes gather more light than ...