The cornea is the reasonable tissue at the upfront of the eye. Its straight forwardness allows light to go into the eye, through the understudy and onto the retina at the back of the eye. The three noteworthy corneal layers are the external layer of the cornea or epithelial layer, the center layer named the stroma, a solitary layer of cells called the endothelium. The ebb and flow of the cornea assumes an essential part in centering light. The typical cornea is smooth, clear, and extreme. It shields the eye from contamination and outside material.