what organisms causes eye corneal ulcer
Corneal ulcer. A corneal ulcer is usually due to a bacteria or virus causing a painful, red eye. The corneal ulcer may feel like something is in the eye irritating it and there may be increased sensitivity to light.People who get a lot of cold sores often develop corneal ulcers. Bacterial infections cause corneal ulcers and are common in people who wear contact lenses. 2  Viral infections are also possible causes of corneal ulcers. 3  Such viruses include the herpes simplex virus (the virus that causes cold sores) or the varicella zoster virus (the virus that causes chickenpox and shingles).