Herpetic corneal ulcer. Fluorescein dye (with blue excitation) being used to highlight (white and light blue area) an ulcer of the cornea of the eye. This ulcer is due to an infection of the cornea by the herpes simplex virus, a condition known as herpes simplex keratitis. Keratitis is an inflammation of the cornea, the transparent front part of the eye. This is the patient's left eye.
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