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.

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 ...

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

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

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 ...