1 Department of Ophthalmology and Visual Neurosciences, University of Minnesota School of Medicine (MJB), Minneapolis, Minnesota; Department of Ophthalmology (JAK, JJC), Mayo Clinic Hospital, Rochester, Minnesota; Department of Ophthalmology & Visual Neurosciences (MSL), University of Minnesota, Minnesota; and Departments of Neurology (SJP, JJC) and Radiology (PJF), Mayo Clinic Hospital, Rochester, Minnesota.