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Medically reviewed by Christine L. Larsen, MD Glassy eyes occur when your eyes appear glazed over or shiny, like glass.

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

They also betray mental and emotional commotion within. In fact, pupil dilation correlates with arousal so consistently that researchers use pupil size, or pupillometry, to investigate a wide range of ...

"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 ...

To go further: why do pupils change size? The size of the pupils is regulated by muscles in the iris, which contract or dilate in response to light and brain activity. These changes are controlled by ...

Two factors, in particular, could reveal a person’s inner state: the length of time it takes the pupil to dilate in response to a flash of light and how the pupil transitions from dilation to ...