What part of the eye allows light to pass into the back of the eye?

The pupil is the correct part of the eye that allows light to pass into the back of the eye. It is essentially an opening located in the center of the iris, which is the colored part of the eye. The size of the pupil can change in response to lighting conditions and emotional states, allowing more or less light to enter.

When light enters the eye, it first passes through the cornea, which helps to focus the light. The light then travels through the pupil, where the amount of light entering can be adjusted. Following the pupil, the light hits the lens, which further focuses it onto the retina at the back of the eye. The retina contains photoreceptor cells that convert the light into electrical signals that are sent to the brain to form visual images.

Understanding the function of the pupil is essential, as it plays a crucial role in regulating the light that ultimately reaches the retina, influencing visual clarity and depth of field.