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A 25-year-old woman presents with a one-week history of blurred vision in the left eye. One day before the onset of visual loss, she noted a dull ache in the left periorbital region and pain on eye movement. Her symptoms progressed for three days but have not worsened since. She has no history of other visual or neurologic symptoms. Examination reveals visual acuity of 20/40 in the left eye, reduced color perception, and a left afferent pupillary defect. There is no visible swelling of the optic disk or pallor of the optic nerve, and a neurologic examination is normal. How should she be evaluated and treated?
Laura J. Balcer (Wed,) studied this question.
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