Pupil size changes because two sets of smooth muscles in the iris control how much light enters the eye. One set of muscles forms a circular band around the pupil. When these circular muscles contract, the pupil becomes smaller. This happens in bright light to protect the retina from excessive illumination. The contraction is controlled by parasympathetic signals that tell the muscles to tighten. The second set of muscles lies in a radial pattern, extending outward from the pupil like spokes. Wh
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