Pink eye is the other name of infectious conjunctivitis. It is an acute infectious eye inflammation if we contacts of patients as well as his personal hygienic products. Corneal edema is also named disciform keratitis, a kind of viral keratitis. It is caused by infection of virus. In the early time of infection, the patient will feel eyes burning, photophoby, red eyes and pain. In the later period, the eyelid will turn red and swollen, tears, conjunctiva congestion and edema. So, if you do not pay attention to the pink eyes in the initial stage, it will develop to the serious disease such as corneal edema which the symptom of later period. Please go to doctor in the early time and prevent it before it happens. Actually, it's easy to get but still have way to protect. Good health habit would keep a far distance away from the bacterial and virus to your eyes.