Edward Margolin1,2, Ari Shemesh3,4. 1. Department of Ophthalmology and Vision Sciences, Faculty of Medicine, University of Toronto, 801 Eglinton Ave West, Suite 301, Toronto, ON, M5N 1E3, Canada. Edward.margolin@uhn.ca. 2. Division of Neurology, Department of Medicine, University of Toronto, Toronto, ON, Canada. Edward.margolin@uhn.ca. 3. Department of Ophthalmology and Vision Sciences, Faculty of Medicine, University of Toronto, 801 Eglinton Ave West, Suite 301, Toronto, ON, M5N 1E3, Canada. 4. Division of Neurology, Department of Medicine, University of Toronto, Toronto, ON, Canada.