1. University of Western Ontario, 1201 Western Road, London, Ontario, N6G 1H1, Canada
2. Faculty of Health Sciences, University of Ottawa, 43 Templeton Street, Ottawa, Ontario, K1N 6X1, Canada
3. Centre for Sight Enhancement, and professor, School of Optometry, University of Waterloo
4. Low Vision Clinic, Centre for Sight Enhancement and School of Optometry, University of Waterloo, Waterloo, 200 University Avenue West, Waterloo