Answer :
Final answer:
The iris, located at the anterior part of the eye, regulates the amount of light entering the eye by altering the size of the pupil according to the light conditions.
Explanation:
The iris is a pigmented, circular muscle located at the anterior, or front, of the eye. Its primary function is to regulate the amount of light entering the eye. The iris achieves this by changing the diameter of the pupil, the hole located at the center of the iris through which light enters. In bright conditions, the iris contracts, reducing the size of the pupil to limit the amount of light that enters the eye. Conversely, in low light conditions, the iris relaxes, causing the pupil to enlarge and allow more light to enter the eye. Ultimately, the iris plays a vital role in visual acuity by controlling the light intensity reaching the retina, the light-sensitive layer at the back of the eye.
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