Visual Problems Practice Test 2026 – The All-In-One Guide to Mastering Visual Challenges!

The iris is the structure recognized as the colored part of the eye. It is a thin, circular structure located behind the cornea and in front of the lens. The iris consists of muscle tissue that can contract or relax to adjust the size of the pupil, which controls the amount of light entering the eye. The color of the iris, which can vary from person to person, is determined by the amount of melanin present and the structural properties of the tissue.

Understanding the function and appearance of the iris is essential, as it plays a crucial role in vision by regulating light intake and contributing to the aesthetics of the eye. The other options represent different parts of the eye: the cornea is the clear front layer that refracts light, the retina is the light-sensitive layer at the back of the eye that processes visual information, and the sclera is the white outer coating that provides structure and protection.