







































  

   
 

[Page 23] 

Correspondence:      Conflict of Interest:  The authors report no conflicts of interest.  
Choi Mun Chan, MBBS    Contributions:  All authors contributed equally. 
Singapore National Eye Centre   Accepted for Publication:  May, 2018 
11 Third Hospital Avenue    This work is licensed under a Creative Commons Attribution 
Singapore 168751    Non-Commercial 3.0 License (CC BY-NC 3.0). 
E-mail: chan.choi.mun@snec.com.sg  ©Copyright Chan et al., 2018.   
Phone:  (65) 6322-8330    Licensee Ophthoscience Publishers, USA 

 



  

 
 

[Page 24] 



  

 
 

[Page 25] 

 


