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PURPOSE.We examined the distribution of intraocular pressure(IOP)and its associated factors in children.METHODS.Using a random cluster sampling from kindergartens,primary schools,and junior and senior high schools from rural Guanxian County and the city of Weihai,the school-based cross-sectional Shandong Children Eye Study included children aged 4 to 18 years.All participants underwent an ocular examination,including ocular biometry,cycloplegic refractometry,and noncontact tonometry.