"Miosis" is a medical term that describes the constriction of the pupils. Learn its causes, symptoms, and how to treat it.

pupil movement might one day be used to detect disorders such as insomnia and post-traumatic stress disorder, or even a comatose patient’s recovery. We haven’t yet figured out if eyes are ...

In fact, many bats, nocturnal snakes and lizards have no cones at all ... this return trip passes out of the eye the same way it came in—through the pupil. The presence of the tapetum can ...

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.

The ETH researchers developed a new method for examining the changes in people's pupils while asleep: using a special adhesive technique and a transparent plaster, they were able to keep the eyes ...

Pupillometry measures the size and reactivity of the pupil, the dark circle at the eye’s centre through which light enters. Typically, the pupil contracts and dilates depending on the amount of ...

In fact, many bats, nocturnal snakes and lizards have no cones at all ... this return trip passes out of the eye the same way it came in—through the pupil. The presence of the tapetum can ...