The pupils of our eyes get larger when we are focusing on a task–and the size may give clues about our working memory capabilities, a new study has found. A person's pupils dilate in low-light ...

A yearly dilated eye exam could protect more than just your vision. Problems spotted in the eye are often the first warning of disease elsewhere in the body. Fortunately, eye doctors may be the first ...

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 ...

Researchers found an optical illusion triggers the pupils to dilate as if light were dimming. It provides clues about how the brain processes images. The image is by Japanese researcher Akiyoshi ...