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Choroidal vascularity index measurement in a patient with arteritic anterior ischemic optic neuropathy (A) and a patient with nonarteritic anterior ischemic optic neuropathy (B). (A) CVI was 65.1% in the patient with arteritic anterior ischemic optic neuropathy. (B) CVI was 68.3% in the patient with nonarteritic anterior ischemic optic neuropathy.
