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30 August, 14:20

Describe the role of the circular and radical muscles of the iris in accommodation.

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  1. 30 August, 16:25
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    The tiny muscles that make up the iris, known as the circular and radial muscles, relax and contract to maintain a fairly constant level of light entering the eye. In bright light, the circular muscles contract whilst the radial muscles relax. This causes the pupil to constrict and less light enters the eye.
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