1 Department of Ophthalmology and Visual Sciences and Department of Neurology, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah Department of Ophthalmology, Dean McGee Eye Institute, University of Oklahoma, Oklahoma City, Oklahoma Department of Ophthalmology, University of Cincinnati and the Cincinnati Eye Institute, Cincinnati, Ohio Save Sight Institute, University of Sydney, Sydney, Australia International Neurologic and Psychiatric Epidemiology Program; Department of Pediatric Neurology, Michigan State University, East Lansing, Michigan.