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- Eye Pigmentation: The coloring of a person's eyes, especially when abnormal or distinctive.
- Iris: This is the part that surrounds the pupil and contains the color. The iris controls the dilation and constriction of the pupils. If you shine a light into someone’s eye, his or her iris will contract. This reduces the size of the pupil. This function of the iris is important in terms of regulating the amount of light that enters the eye.