Pupils play an essential role in a person’s vision and health. They are small, round, and dark openings in the center of the colored part of the eye, called the iris, that allow light to enter the eye. Every person’s individual pupil size is unique, as pupil size usually changes based on the light levels present. Pupils are also incredibly important to a person’s vision. The larger the pupil, the more light that can enter the eye and help the eye perceive images. Furthermore, the pupil also acts as a type of adjustment mechanism for the eye, enabling the eye to adapt to different levels of light. During periods of low visibility, such as at night, the pupil dilates, allowing more light to enter the eye and improve vision. Similarly, during periods of higher visibility, such as during the daytime, the pupil contracts, decreasing the amount of light entering the eye and reducing the risk of overexposure. Overall, pupils play a critical role in helping people see the world around them. Without pupils, vision would be significantly impaired and the amount of light entering the eye would not be adjustable. As such, taking care of the eyes and keeping the pupils healthy is essential to ensure that people receive the clearest vision possible.