Eye surgery with laser beam showing iris contraction. Futuristic medical technology for vision correction and eye health concept.
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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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The Contraction of Pupil of the Eye in the Presence of Bright Light is an Example of : (A) Voluntary Reflex (B) Spinal Reflex (C) Cerebral Reflex (D) Adrenal Reflex - Science | Shaalaa.com
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A cuttlefish’s skin isn’t the only part of its body that’s subject to change. The pupil will change shape in different lighting conditions. Under bright light conditions a cuttlefish displays a distinctive W-shaped pupil. However, in darkness the pupil becomes large and circular. Full contraction takes less than 1 second. #SealifeSaturday by 🦑 🎥 by Hunting For Paradise | Science Channel
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