Light entering the eye first passes through which part?

Light entering the eye first interacts with the cornea. The cornea is the transparent outer layer of the eye that provides most of the eye's optical power by bending (refracting) the incoming light. This initial refraction is crucial because it helps to focus light onto the retina at the back of the eye, where images are formed and subsequently processed by the visual system.

The iris and the pupil come into play after the cornea; the iris is responsible for controlling the size of the pupil, which regulates the amount of light that enters the eye. The pupil itself is the opening in the center of the iris. The retina, located at the back of the eye, is where the light finally converges to create visual signals that are sent to the brain. Therefore, understanding the path light travels through the eye emphasizes the critical role of the cornea as the first interface of light entry.