Elderly man presents with acute-onset nonprogressive blurred vision in right eye

A 79-year-old man presented to Tufts New England Eye Center with a 6-week history of acute-onset nonprogressive blurred vision and reduced color vision in the right eye. The patient’s complete ocular and systemic review of systems was otherwise negative, including headache, weight loss, fevers or night sweats.
The patient’s medical history was notable for a remote history of prostate cancer that had been treated with radioactive seed implant in 1998. He had been recently hospitalized for renal failure of unclear etiology. His other medical conditions included insulin-dependent

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