[1] Univ Manitoba, Max Rady Coll Med, Rady Fac Hlth Sci, Winnipeg, MB, Canada
[2] Univ Toronto, Dept Med, Div Neurol, Toronto, ON, Canada
[3] Univ Toronto, St Michaels Hosp, Dept Med Imaging, Div Neuroradiol, Toronto, ON, Canada
[4] Univ Toronto, Dept Ophthalmol & Vis Sci, Toronto, ON, Canada
[5] St Michaels Hosp, Dept Ophthalmol, Unity Hlth, Toronto, ON, Canada
[6] Kensington Vis & Res Ctr, Toronto, ON, Canada
[7] Univ Toronto, Kensington Vis & Res Ctr, 501-340 Coll St, Toronto, ON M5T3A9, Canada