The cornea is the clear, dome-shaped front surface of the eye. It plays a crucial role in focusing light onto the retina, which is located at the back of the eye. The cornea is made up of several layers and is responsible for about 70% of the eye's total focusing power. Because it is transparent, it allows light to enter the eye without obstruction. In addition to focusing light, the cornea also protects the inner parts of the eye from dust, germs, and other harmful substances. It is sensitive to touch and can heal quickly if injured. Proper care of the cornea is essential for good vision, making regular eye check-ups important for maintaining eye health.