Well, generally speaking, as we know that a corneal ulcer can be caused if the clear coating and cornea has been rubbed or irritated. In this way, it will also lead to a small tear or cut. So for people who get this disease, it will be painful. In some cases, it can make your eyes infected easily. You should remember that it can be the risk of vision loss. Anyway, just be careful. When you have some symptoms, you should go and see an eye doctor. And the eye drop will be dropped frequently. Also, a cold compress and Ibuprofen can be used to prevent eye pain. But the most essential task is to have an eye test.