Medications, trauma, and medical conditions can cause miosis or constricted pupils. Seek emergency help if you experience signs of a stroke, like confusion or trouble speaking. A healthcare provider ...

Working memory is one of the brain's executive functions, a skill that allows humans to process information without losing track of what they're doing. In the short term, working memory allows the ...

A new technological development allows researchers, for the first time, to monitor changes in pupil size and gaze direction behind closed eyes using touchless infrared imaging. In the future, tracking ...

The iris is a structure behind the transparent cornea of the eye. It has a circular opening called the pupil that changes size in response to the light level. Your pupils are usually the same size as ...

Normally, a person's pupils naturally widen (or dilate) in low-light environments to allow more light into the eye. However, in a new study, researchers reported that a person's pupils also dilate ...