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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2.4K views · 193 reactions | This is what we call original old school contraction, when I joined my friends Lionhat band on stage having a laugh at Falmouth Reggae Festival - Big thank you to our friend Gina for this video #reggae #dafuchaman #lionhat #falmouthreggaefestival | Da Fuchaman | Facebook
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