
The iris is the colored part of the eye, located between the cornea and the lens. It controls the size of the pupil and, consequently, the amount of light that enters the eye. The iris is made up of muscles that contract or dilate to adjust the size of the pupil in response to changing light conditions. In bright light, the iris contracts to make the pupil smaller, reducing the amount of light that enters the eye. In dim light, the iris dilates to allow more light in, improving vision. The color of the iris is determined by the amount of melanin pigment, and it can range from blue, green, or brown to hazel or gray.
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