Abstract:Background: To calculate and evaluate the prevalence of reduced uncorrected distant visual acuity (UCDVA) in primary and secondary school students in 6 districts of Changsha, Hunan, China. Methods: A population-based retrospective study was conducted in 239 schools in 6 districts of Changsha. After routine eye examination to rule out diseases that can affect refraction, 250,980 eligible students from elementary, middle and high schools were enrolled in the survey. Then the uncorrected distant and near visual a… Show more
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