The cornea is the clear outer layer of the eye that helps focus light to create an image on the retina. When the cornea becomes damaged, blurry vision, pain, and sensitivity to light can result. In some cases, a corneal transplant (also known as a corneal graft) may be recommended to restore vision.The cornea is the clear outer layer of the eye that helps focus light to create an image on the retina. When the cornea becomes damaged, blurry vision, pain, and sensitivity to light can result. In some cases, a corneal transplant (also known as a corneal graft) may be recommended to restore vision.