In a brightly lit room, the size of the pupil and lens become smaller.
• The pupils that are larger than normal are known as the dilated pupils.
• The size of the pupils is monitored by the tiny muscles in the iris, that is, the colored part of the eye and the amount of light reaching the eyes.
• In bright light, the pupils get smaller or constrict to inhibit too much light from invading the eyes. In dim lights, the pupils get larger or dilate to permit more light in.
• In bright light, the ciliary muscles contract and the radial muscles relax. This makes the lens to change its shape, it becomes smaller.
Thus, the size of the pupil and the shape of the lens become smaller in bright light.
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