The pupil, controlled by the iris, adjusts in size to regulate the amount of light entering the eye. In bright conditions, the pupil constricts to reduce the light, while it dilates in low-light conditions to allow more light in.
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The pupil, controlled by the iris, adjusts in size to regulate the amount of light entering the eye. In bright conditions, the pupil constricts to reduce the light, while it dilates in low-light conditions to allow more light in.
The pupil, a central opening in the iris, regulates the amount of light entering the eye. Controlled by the autonomic nervous system, the iris adjusts the pupil size based on lighting conditions. In bright environments, the iris contracts, causing the pupil to constrict, reducing the amount of light entering the eye. Conversely, in low-light conditions, the iris expands, leading to pupil dilation, allowing more light to reach the retina. This dynamic adjustment, known as the pupillary reflex, optimizes visual sensitivity and clarity, ensuring the eye adapts effectively to varying levels of ambient light for optimal vision.