Tien-En Tan1, Tien Yin Wong1, Daniel Shu Wei Ting2. 1. Singapore Eye Research Institute, Singapore, Singapore National Eye Centre, Singapore; Duke-National University of Singapore Medical School, Singapore. 2. Singapore Eye Research Institute, Singapore, Singapore National Eye Centre, Singapore; Duke-National University of Singapore Medical School, Singapore. Electronic address: daniel.ting.s.w@singhealth.com.sg.