**Author details**

Amani Al Kofide1 \* and Eman Al-Sharif<sup>2</sup>

1 Department of Pediatric Hematology/Oncology, King Faisal Specialist Hospital and Research Centre (Gen. Org.), Riyadh, Saudi Arabia

2 Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia

\*Address all correspondence to: kofide@kfshrc.edu.sa

© 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.
