Chelvin C A Sng1, Jing Wang, Keith Barton. 1. *Glaucoma Service, Moorfields Eye Hospital §National Institute for Health Research, Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital ∥Department of Epidemiology and Genetics, Institute of Ophthalmology, University College, London, UK †Department of Ophthalmology, National University Health System ‡Singapore Eye Research Institute, Singapore.