Tzu-En Kao1, Yu-Wei Kuo2, Kwou-Yeung Wu3. 1. Department of Ophthalmology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan. Electronic address: kao.tzuen@gmail.com. 2. School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. 3. Department of Ophthalmology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Ophthalmology, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.