structure of the cornea medical vector illustration on white backgroundThe cornea is the outermost layer of the eye; it is a clear, dome-shaped surface that covers the front of the eye. The cornea has two functions: it helps shield the eyes from harmful materials, and it acts as the eye’s lens. When light hits the cornea it refracts the incoming light onto the lens and refocuses the light on the retina. There are certain eye injuries or diseases that can affect the cornea and prevent you from seeing clearly including: