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 ...

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.

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 ...