1 Faculty of Medicine (BT), The University of British Columbia, Vancouver, Canada; Department of Ophthalmology and Vision Sciences (JM), Toronto Western Hospital, University Health Network, University of Toronto, Toronto, Canada; Division of Neurology (JM), Department of Medicine, University of Toronto, Toronto, Canada; Kensington Vision and Research Center (JM), Toronto, Canada; St. Michael's Hospital (JM), Toronto, Canada; Toronto Western Hospital (JM), Toronto, Canada; and University Health Network (JM), Toronto, Canada.