1. From the State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China;
2. the School of Optometry and 3The Hong Kong Jockey Club Sports Medicine and Health Sciences Centre, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Hong Kong, SAR, China;
3. the Department of Ophthalmology, McGill University, Montreal, Quebec, Canada; and
4. the School of Optometry and
5. the Department of Optometry and Vision Science, The University of Auckland, Auckland, New Zealand.