**Author details**

Sangeethabalasri Pugazhendhi1 , Balamurali Ambati<sup>2</sup> and Allan A. Hunter3 \*

1 PSG Institute of Medical Sciences and Research, India

2 Pacific ClearVision Institute, Oregon, USA

3 Oregon Eye Consultants, Eugene, Oregon, USA

\*Address all correspondence to: hunter.allan.a@gmail.com

© 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.
