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.

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

Attitude and Pupil Size Dilation and constriction of the pupils reflect not only changes in light intensity but also ongoing mental activity. The response is a measure of interest, emotion ...

Larsen, MDThe pupil is the opening located in the center of the iris of the eye. It controls the amount of light that enters ...

Please provide your email address to receive an email when new articles are posted on . Pupil snap, described by Dr. Ronald Yeoh, is an ominous sign during a phacoemulsification procedure, marking ...