First, we have to make the definition of the cornea as the transparent membrane of the front of the eye. That is why a corneal ulcer is an erosion that occurs in this outer layer and often causes or is caused by an infection.

The most frequent symptoms of corneal ulcers are blurred vision, itching, watery and very painful eyes, and the white patch on the cornea (associated with herpes).

Other symptoms are very similar to those that occur with conjunctivitis, that is, the eye looks very red or it is injected in blood. Read More http://zeliom.com/corneal-ulcer-treatment-for-ulcers-in-the-eyes