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420度是视力的多少

更新时间: 2020-11-04 00:00:00     

420度是视力的0.08,成年人的视力大于等于1.0,是正常视力,(视力包括近视力和远视力)。视力检查时,周围环境需要充足的光线,双眼分别进行检查,一般先查右眼再查左眼。

检查一只眼时,要用遮眼板挡住另外一只眼睛,自上而下,逐行依次辨认视力表上的视标。检查近视力时,被检眼距离视力表30厘米,检查远视时,被检眼距离远视力表五米。

关键词: 视力 多少

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