History of Present Illness

A man in his late 40s comes to the emergency department with a complaint of blurry vision that lasted for approximately 20 minutes before returning to normal. The loss of focused vision affected both eyes, which the patient checked independently. The patient reports no occurrence of double vision or vision going black or dark, and he did not feel weak or light-headed. About 10 minutes into his vision change, the patient experienced gradual onset of a mild left-sided headache that resolved. He denies any change in speech, balance, strength, coordination, or other symptoms.

Vital Signs and Physical Examination

The patient is healthy with no prior history of vision problems. The patient’s vital signs are normal including fields of vision and visual acuity. Laboratory tests are normal and relevant testing includes magnetic resonance imaging (MRI) of the brain (Figure).

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