7. Benign episodic unilateral mydriasis Benign episodic unilateral mydriasis (BEUM) is a condition in which the pupil in one of your eyes spontaneously dilates. It can stay dilated for just a few ...

A contracted pupil during sleep may be an indication the brain is replaying new memories while a dilated one may hint at older memories being relived, a new study suggests. The study, published in ...

Medically reviewed by Christine L. Larsen, MD The pupil is the opening located in the center of the iris of the eye. It ...

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

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.

OP-ED. At a time when hoaxes flourish, psychology researcher Sylvie Chokron explains in a column how to spot mythomaniacs ...

Spock decides to try to help one of his underachieveing pupils and finds him a job at Mr. Wang's. On the same evening, Mr. Wang persuades Diesel to dress up as The Artist Formally Known as Prince in ...