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A 42-year-old Hispanic male presented complaining of decreased vision in his left eye. He noted that his vision in that eye had decreased suddenly three weeks earlier. The patient had low hyperopia. His medical, surgical, and family histories were unremarkable. He was using no medications and had no known drug allergies. Although he initially reported no significant social history, after more extensive questioning he admitted to the occasional inhalational use of cocaine. His most recent use was on the day prior to the onset of his visual disturbance.