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1991～1996年对我县实验小学的159名学生进行了六年的视力追踪调查，现将结果报告如下。1对象县实验小学一年级242名小学生进行连续六个追踪调查，从1991～1996调查结束时全程追踪159名。2方法采用标准对数视力表，按小数记录，凡裸服或双眼视力低于50者，就定为视力低下，双眼
1991 to 1996, I County Experimental Primary School 159 students conducted a six-year vision tracking survey, the results are reported as follows. 1 target County primary school primary school 242 primary school students for six consecutive follow-up survey, from 1991 to 1996 at the end of the investigation tracking 159. 2 Methods The standard logarithmic visual acuity chart, according to decimal records, where naked clothes or binocular vision less than 50 were set as low vision, eyes