... aged 6-15 years in Yongchuan, a socio-economically repre-sentative area in Western China. We carried out a door-to-door survey and actual eye examinations, including visual acuity measurements, ... visual acuity as-sessment, stereopsis, anterior segment and eye movement examinations, eye drop instillation, cyc-loplegic retinoscopy, and fundus examination. The quality of examination for ... incon-venience in transporting auxiliary equipment on rugged mountain roads in the study regions, should be considered a weakness of this study. In summary, our results indicate that an increase...