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。

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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。

youdao