Retina Service; Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA. Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, China. Harvard Retinal Imaging Lab, Massachusetts Eye and Ear, Boston, Massachusetts, USA. Eye Center of Xiangya Hospital, Central South University, Changsha, Hunan, China. Boston University School of Medicine, Boston University, Boston, Massachusetts, USA. Wenzhou Medical University Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China. Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA. Retina Service; Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts, USA john_miller@meei.harvard.edu.