Elizabeth L Irving is a Professor at the University of Waterloo, School of Optometry and Vision Science, with a cross appointment to the Department of Mechanical and Mechatronics Engineering. She was the head of the Binocular Vision Service at the School until taking up a Canada Research Chair in 2001. She is an Affiliated Scientist with the Vision Science Research Program at the Toronto Western Hospital, with adjunct appointments to the Department of Ophthalmology, University of Toronto and the CVR at York University. Dr.