Validity and feasibility of a self-administered home vision examination in Yueqing, China: a cross-sectional study by Nathan Congdon, Yuan Lan, Lynne Lohfeld, Yuanbo Liang, Zhengyan Ge, Linshan Li, Chunjie Lu, Sigeng Lin, Yuxuan Deng, Shaodan Zhang, Laurence Hou, Weihe Zhou, Lele Cui, Jia Qu

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