There's another common situation when the pupil of the eye changes color — when someone takes your photo using the camera's flash function. Depending on your direction of gaze when the photo is taken, your pupils might appear bright red. read more
The pupil of the eye is the black circle in the center of the iris. The iris is the colored ring in the eye with a color and structure unique to each person. From the outside of the eye, light passes through the clear lens, then through the pupil. read more
The eye itself has only one part that changes in a manner that is visible to others and that is the pupil. The pupil is the circular opening in the middle of the iris. It opens and closes to control the amount of light that is allowed to enter the eye. read more
The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. read more