**Author details**

Yu Meng Wang and Calvin C.P. Pang\* Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, China

\*Address all correspondence to: cppang@cuhk.edu.hk

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
