1. Department of Ophthalmology, Taipei Veterans General Hospital, Taipei City, Taiwan;
2. Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei City, Taiwan;
3. Industrial Technology Research Institute, Taipei City, Taiwan;
4. Department of Materials Science and Engineering, National Tsing-Hua University, Taipei City, Taiwan; and
5. Division of Computer Science and Engineering, University of Michigan, Ann Arbor, Michigan.