Add Yahoo as a preferred source to see more of our stories on Google. Pupils often dilate in response to low light. Radu Bighian/Getty Images Dilated pupils mean that your pupils appear larger in size ...

Dilated pupils (mydriasis) occur when the pupils open larger than usual. This normally happens in darker lighting to allow more light into the eye, but dilated pupils can also indicate an underlying ...

Pupil dilation may signal deception. The autonomic nervous system regulates pupil size. Pupil dilation normally indicates an increase in cognitive demand. Liars usually experience an increase in ...

His gaze softens as he draws closer to you. With one hand around your waist and the other cradling your jaw, he pulls you in. You look into his eyes, and notice his pupils have grown large and hungry.

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. The pupils of our eyes get larger when we are focusing on a task–and ...

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 ...

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 ...

Pupils are the black circles located in the center of your iris, or the colored part of your eye. The pupil allows light to enter your eye and often changes in size. When your pupils appear larger, ...

The size of your pupils can say a lot about your health and your state of mind. In most cases, pupils change size based on the light and dilate, meaning that appear larger, when you're in a darker ...