DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Corneal ulcer (green/brown, centre) on the eye of an 80-year-old woman. The yellowing of the white of the eye (sclera) is caused by a green fluorescein dye, which allows the ulcer to be seen. A corneal ulcer is an infected break in the surface of the eye that fails to heal and becomes inflamed. The condition is caused by injury or infection and is very painful. Treatment depends on the infectious agent present; for example, bacterial ulcers are treated with antibiotics.
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