What is the function of the cornea?

The primary function of the cornea is to let light into the eye. It acts as a transparent barrier at the front of the eye, allowing light to pass through while also playing a crucial role in focusing that light onto the retina. The curvature and shape of the cornea contribute to the eye's overall ability to focus images, making it essential for clear vision.

While the cornea does provide some level of protection and contributes to maintaining the eye's shape, its most vital role is in the refraction of light entering the eye. The cornea is not involved in providing nutrition to the retina, as that is the responsibility of other structures within the eye, such as the choroid layer.