It's made up of at least 10 ... with two sides that can close like a sliding door, is far better at this task, which is why so many nocturnal eyes have slit pupils. These apertures can be vertical ...

Having abnormally small pupils may indicate a health problem. The pupil, the dark center of the eye, determines how much light reaches the light-sensing retina at the back of the eye. Muscles in ...

In fact, more goes on behind our closed eyelids than we previously thought, according to a team of researchers that recently analyzed eye ... up study. If they do find a strong causal relationship ...

The peripheral drift illusion causes us to perceive motion in a still image. A new study shows that the mechanism of this illusion relies on changes in pupil size.

It's made up of at least 10 ... with two sides that can close like a sliding door, is far better at this task, which is why so many nocturnal eyes have slit pupils. These apertures can be vertical ...