Description: The pupil is the opening in the center of the iris of the eye that allows light to enter. Its size varies in response to lighting conditions and emotional arousal, thus regulating the amount of light that reaches the retina. This mechanism is fundamental for vision, as a dilated pupil allows more light to enter in low-light conditions, while a constricted pupil reduces light entry in bright environments. The pupil also plays a role in depth perception and visual adaptation, allowing the eye to adjust to different light levels. Its color and shape can vary among individuals, but its function is essential for visual health and overall well-being. The pupil is a key element in ocular anatomy, and its study is important in fields such as ophthalmology and neurology, where changes in its size and reactivity can indicate various health conditions.
