Analysis on vision impairment burden in China in 2015 
WANG Bing-song1, DONG Wen-lan2, CAO Kai1, ZHAO Ai-ping3, HU Jian-ping1.
Ophthalmology in China . 2018, (4): 264 -268 .  DOI: 10. 13281/j. cnki. issn.1004-4469. 2018. 04. 005