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 ...

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 ...