It is serious. As we know, the cornea is a layer of transparent thin in front of the eye which is often exposed to the air. And the contact germs have more opportunities to get foreign trauma of corneal. The damage on the transparent thin layer, sand hole, the stabbed corneal, bacteria, fungi, viruses can all cause infection and produce corneal ulcer. In addition, the allergy caused by tuberculosis, the lack of vitamin, the facial paralysis and the bad eyelid closure caused by eyelid scar all may cause corneal ulcer. Since you get the corneal ulcer, you may accept the treatment as soon as possible. Usually the surgery is safe and effective. However, if you don't treat it in time, it may become serious and cause the blindness.