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In page Corneal ulcer:
"Refractory corneal ulcers can take a long time to heal, sometimes months. In case of progressive or non-healing ulcers, surgical intervention by an ophthalmologist with corneal transplantation may be required to save the eye. In all corneal ulcers it is important to rule out predisposing factors like diabetes mellitus and immunodeficiency. Conjunctival flap may be drawn over the ulcer as an alternative.[citation needed]
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