We observed a notable trend of increasing prevalence of reduced VA with grade level, from 8.10% in grade 1–31.03% in grade 9.
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Vision screening of school-aged children in Wuqia County: a cross-sectional study in western China.
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We observed a notable trend of increasing prevalence of reduced VA with grade level, from 8.10% in grade 1–31.03% in grade 9.