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The top image shows an opaque bacterial corneal ulcer (usually gray-white, but yellowish in this photo because it was stained with fluorescein dye—black arrow) and reddening of the conjunctiva. A layer of pus (blue arrow) lies inside the eye at the very bottom of the iris. The bottom image shows improvement after 1 week of antibiotic eye drops.
Images courtesy of Sadeer Hannush, MD.