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A circular ulcer is present in the central cornea in stage 3 of neurotrophic keratitis. The borders of the ulcer are clear-cut with no sign of epithelial healing. | Bonini, S., Rama, P., Olzi, D. et al. Neurotrophic keratitis. Eye 17, 989–995 (2003). https://doi.org/10.1038/sj.eye.6700616

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