Dry eye syndrome. Fluorescein dye (with blue excitation) being used to highlight (green area) inflammation and ulceration of the cornea and conjunctiva of the eye in a case of dry eye syndrome (DES), also known as keratoconjunctivitis sicca (KCS). Dry eye occurs when the eye does not produce enough tears or when they evaporate too quickly. Scarring of the cornea may occur if the condition is left untreated. This is the patient's left eye.
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