1. The George Institute for Global Health, UNSW Sydney, Newtown, NSW, Australia
2. Westmead Hospital Ophthalmology Department, Westmead, NSW, Australia
3. School of Optometry and Vision Science, UNSW Sydney, Sydney, NSW, Australia
4. UCL Institute for Global Health, London, UK
5. Centre for Vision Research, Westmead Institute for Medical Research, Sydney Medical School, University of Sydney, Westmead, NSW, Australia