1. Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
2. Glaucoma Research Chair, King Saud University, Riyadh, Saud Arabia
3. Department of Ophthalmology, College of Medicine, Al-Imam Muhammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
4. Department of Ophthalmology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
5. Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, ON, Canada