1. Anterior Segment Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
2. College of Medicine, King Saud University, Riyadh, Saudi Arabia
3. Department of Ophthalmology, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
4. Department of Optometry, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
5. Department of Research, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
6. Department of Ophthalmology, Faculty of Medicine, University of British Columbia, Vancouver, Canada