The Sweet

The slit in the iris, known as the "pupil," functions like a camera aperture, controlling the amount of light that enters the eye. When it's bright, the pupil constricts to limit light; in darkness, it dilates to allow more light in. This regulation helps the eye focus properly and protect sensitive internal structures. The size of the pupil also affects how much of the colored part of the eye (iris) is visible, providing clues about emotions or autonomic nervous system activity. Overall, the pupil plays a crucial role in visual adaptation and communication.