State Key Laboratory of Ophthalm ology Zhongshan Ophthalmic Center Sun Yat-sen University Guangzhou 510060 Guangdong Province China;
Aier School of Ophthalmology Central South University Changsha 410000 Hunan Province China;
Royal Victorian Eye and Ear Hospital Melbourne 3000 Australia;
polypoidal choroidal vasculopathy; vitreous hemorrhage; vitrectomy; visual acuity;