The transparent front part of the eye is called the cornea. It covers the iris, which is the colored part of the eye, and the pupil, which is the black opening in the center. The cornea helps to focus light as it enters the eye, working together with the lens to create clear images on the retina at the back of the eye. The cornea also protects the eye from dust, germs, and other harmful particles. Unlike the sclera, which is the white outer layer of the eye, the cornea is clear and lets light pass through. The retina is the layer inside the eye that senses light and sends signals to the brain to create vision. The lens is behind the pupil and helps adjust focus for near or far objects.