What is the function of the pupil in the eye?

The pupil serves as the opening in the center of the iris, which allows light to enter the eye. Its primary function is to regulate the amount of light that reaches the retina by constricting or dilating in response to varying light conditions. This adjustment helps to optimize vision in different lighting environments, ensuring that the right amount of light is focused on the retina, where visual information is processed.

Understanding the role of the pupil is essential in the context of eye anatomy and physiology, as it directly influences overall vision quality. The effective regulation of light through the pupil is crucial for both bright and dim conditions, illustrating its importance in visual acuity.