Ming-Chieh Hsieh1, San-Ni Chen2. 1. Department of Ophthalmology, Changhua Christian Hospital, Changhua, Taiwan. 2. Department of Ophthalmology, Changhua Christian Hospital, Changhua, Taiwan; College of Medicine, Chung-Shan Medical University, Taichung, Taiwan; Department of Optometry, College of Nursing and Health Sciences, Da-Yeh University, Changhua, Taiwan. Electronic address: 108562@cch.org.tw.