The amount of light entering the eye is controlled by which of the following organs?
The amount of light entering the eye is controlled by the Iris. This colored muscular structure behind the cornea regulates the size of the pupil, adjusting its diameter in response to varying light conditions to optimize visual perception.
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The amount of light entering the eye is primarily controlled by the (d) Iris. Positioned between the cornea and lens, the iris is a colored, muscular structure that surrounds the pupil—the black circular opening at the center of the eye. The iris contains muscles that contract or dilate in response to changes in light intensity, regulating the size of the pupil.
In bright light conditions, the iris constricts, causing the pupil to shrink, thereby reducing the amount of light entering the eye to prevent overexposure and maintain optimal visual clarity. Conversely, in low-light environments, the iris relaxes, allowing the pupil to dilate and permit more light to enter, enhancing vision in dimly lit situations.
While the cornea, choroid, and retina are essential components of the eye, they do not directly control the amount of light entering the eye. Instead, their functions relate to focusing light onto the retina, nourishing ocular structures, and sensing light stimuli for vision.