The eyes have to get oxygen and water from the endothelial cells, and the cornea provides the clear and transparent tear drops from which the eyes could get the oxygen and water. When there is excessive corneal hydration accumulated, it will lead to the corneal edema. The corneal edema presents itself as the swelling of the eyes and the inflammation of the cornea, which may be caused by the infection of viruses, complications after surgery, high eye pressure, and some other eye problems. If the corneal edema is left untreated, the condition can be deteriorate. For example, if a person gets corneal edema, he or she needs to pay attention to the prevention of eye infection, or else it would be easy for the corneal edema to develop into keratohelcosis which will leave keratoleukoma affecting the transparency of the cornea and leading to eyelight imperiment. Therefore, if the case is extremely serious, it would be possible to get blindness from the corneal edema. If people get corneal edema, they should go to the doctor's for early diagnosis, in case that the condition gets worse.