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After 1 week of nefazodone therapy the patient experienced headache, confusion, and "gray areas" in her vision, without abnormal ophthalmologic findings.
 ( adverse event: experienced ,  patient: Subject, her: Subject, her: Subject.Gender, headache, confusion, and "gray areas" in her vision, without abnormal ophthalmologic findings: Effect, After 1 week of nefazodone therapy: Treatment, 1 week: Treatment.Time_elapsed, nefazodone: Treatment.Drug) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: experienced ,  patient: Subject, her: Subject, her: Subject.Gender, headache, confusion, and "gray areas" in her vision, without abnormal ophthalmologic findings: Effect, After 1 week of nefazodone therapy: Treatment, 1 week: Treatment.Time_elapsed, nefazodone: Treatment.Drug) 