A Case of Nonarteritic Anterior Ischemic Optic Neuropathy that Recurred in the same Eye within a Month

A 78-year-old woman presented with an upper visual field defect in the left eye. On ophthalmic examination, her best-corrected visual acuity (BCVA) was 1.2 in both eyes. Fundoscopy revealed inferior optic disc swelling. Goldmann visual field test showed an upper visual field defect. The patient was diagnosed with nonarteritic anterior ischemic optic neuropathy (NAION) of the left eye and was followed up without treatment. One month after the initial visit, her BCVA decreased to 0.15 in the left eye. Fundoscopy revealed superior optic disc swelling. Goldmann visual field test showed an inferior visual field defect and central relative scotoma. Based on her clinical findings, she was diagnosed with recurrent NAION. Three months after the initial visit, her BCVA was 0.2 in the left eye, and the optic nerve developed atrophy. This case highlights the importance for clinicians to be aware of NAION recurred in the same eye within a short period of time.