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为了解农村学生视力状况和变化特点,给防治工作提供科学依据,1992年3月至1997年连续6年对西留乡3处中小学学生进行了视力监测.1 对象与方法选择我乡具有代表性的西留初中、沈家初中、西留小学的学生为调查对象.采用国际视力表、人工照明视力箱.视力5.0以上的为正常,4.9以下为视力不良.分轻度(4.9～4.8)、中度(4.7～4.6)、重度(4.5以下)3档.统一方法,专人负责,每年3月检测1次.2 结果与分析2.1 不同年份视力情况1992～1997年的6年中
In order to understand the visual acuity and change characteristics of rural students, to provide scientific basis for prevention and treatment work, from March 1992 to 1997 for 6 years in a row for the West Liu rural three primary and secondary school students were visually monitored.1 The object and method selection I Township has representatives Sex West left middle school, Shen junior high school, West left primary school students for the survey.Using the international visual acuity chart, artificial lighting eyesight box visual acuity of 5.0 or more for the normal, 4.9 the following for poor eyesight.Slightly (4.9 ~ 4.8) , Moderate (4.7 ~ 4.6), severe (4.5 below) 3 files.Uniform method, hand responsible for testing once a year in March .2 results and analysis of 2.1 years of vision in different years from 1992 to 1997, 6 years