Elderly man presents with bilateral decreased vision

An 83-year-old man presented to the New England Eye Center with a 2-week history of decreased vision in both eyes. He felt like letters were “clumping together,” making it difficult to read. He also complained that the inferior half of his vision in the right eye was foggy. He denied any new headaches, jaw claudication, transient visual obscurations, scalp tenderness, recent weight loss or fatigue. He was experiencing new gait instability and poor coordination.
His medical history included congestive heart failure, paroxysmal atrial fibrillation on coumadin, hypertension,

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