Question

Dash controls the amount of light that enters the eye

Answer 1

The structure that controls the amount of light entering the eye is known as the **iris**. The iris is a colored part of the eye surrounding the pupil. It functions like a diaphragm, adjusting the size of the pupil in response to lighting conditions. In bright light, the iris contracts and reduces the size of the pupil to limit the amount of light that enters the eye, while in low light, it relaxes to widen the pupil and allow more light in. This helps to protect the retina and optimize vision in varying lighting conditions.