What is the cornea?
The cornea is the clear front window of the eye. It transmits light to the interior of the eye, allowing us to see clearly. Corneal injury, disease or hereditary conditions can cause clouding, distortion, and scarring. Corneal clouding , much like frost on a glass windowpane, blocks the clear passage of light to the back of the eye, reducing sight sometimes, even to the point of blindness. In addition, some corneal injury and disease can be painful.