👉 Pupils are the black, circular openings in the iris of the eye that regulate the amount of light entering the eye. These structures contain specialized cells called pupillary muscles and are surrounded by a network of blood vessels. When light enters the eye, it causes the pupil to contract or dilate (enlarge or shrink) through these muscles. This adjustment helps optimize the amount of light reaching the retina, enhancing vision clarity and protecting the delicate inner eye structures from excessive brightness. The size of the pupil can vary based on factors such as light intensity, emotional state, and overall health, allowing for dynamic control over visual input.
