Anatomy Practice Exam

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What immediate effect does exposure to bright light have on the eyes?

  1. Pupils dilate

  2. Pupils remain constant

  3. Pupils constrict

  4. Pupils become blurred

The correct answer is: Pupils constrict

Exposure to bright light causes the pupils to constrict, a reflex action known as the pupillary light reflex. This response is controlled by the iris, which adjusts the size of the pupil to regulate the amount of light entering the eye. When bright light is detected, the circular muscles of the iris contract, resulting in a smaller pupil size. This reduction in diameter helps to protect the sensitive retina from excessive light exposure, preventing potential damage and enhancing visual clarity. Thus, the constriction of the pupils is an important mechanism for adjusting vision based on environmental lighting conditions.

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