[A study on the vision of 6905 pupils in primary and middle schools in Chengdu].
Sun
J G
JG
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D014787:Vision Tests; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity