International Journal of Ophthalmology-IJO (English edition) is a global ophthalmological scientific publication and a peer reviewed open access periodical (ISSN 2222-3959). This journal is sponsored by Xi'an Medical Association, China and obtains guidance and support from WHO and ICO/IFOS. It is the only ophthalmological periodical in China indexed by the most authoritative international searching system-SCI-Expanded and PubMed-Central.