Dilation Exam (1) The colored part of the eye is called the iris. It is composed of two muscles. The constrictor and the dilator. The black circle at the center of the iris is called the pupil and is actually just an opening to allow light into the eye. The pupil appears black because the inside of the eye contains pigment to absorb all of the light that enters it, not allowing any of it to reflect back out.
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Dilation Exam (1) The colored part of the eye is called the iris. It is composed of two muscles. The constrictor and the dilator.
