Objective To evaluate diopter state and its distribution of children with subnormal vision at 4-6 years.
目的探索4 ~6岁视力低常儿童的屈光状态及其分布规律。
Objective to investigate the daily living vision and the corrected vision of the aged, and to analyze the reason of subnormal vision and the age specific eye diseases in the aged.
目的调查老年人日常生活视力及矫正视力，分析老年人视力异常原因及常见增龄性眼病。
Objective to investigate the daily living vision and the corrected vision of the aged, and to analyze the reason of subnormal vision and the age specific eye diseases in the aged.
目的调查老年人日常生活视力及矫正视力，分析老年人视力异常原因及常见增龄性眼病。
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