[Mass screening for strabismus and amblyopia among preschool children].
D000367:Age Factors; D000550:Amblyopia / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D013285:Strabismus / Q000453:epidemiology*