The cornea is the clear, dome-shaped front part of the eye that covers the iris and pupil. It plays a crucial role in focusing light onto the retina, which is essential for clear vision. The cornea is made up of several layers and is highly sensitive, helping protect the eye from dust, germs, and other harmful substances. In addition to its protective function, the cornea also helps to filter out some harmful ultraviolet (UV) light from the sun. When the cornea is damaged or diseased, it can lead to vision problems, making it important to take care of your eyes and visit an eye doctor, or optometrist, regularly.