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49和47多少度
更新时间: 2020-11-04 00:00:00  

4、7相当于0.5的视力。视力的多少和近视度数没有直接对应关系,而且有些0.5视力的患者也不一定就是近视,也可能是远视或者散光,甚至可能单纯的视疲劳造成的假性近视。因此要想明确患者具体的屈光度,进行验光检查才可以明确。对于小于18岁的患者,还需要先滴用睫状肌麻痹剂(阿托品眼用凝胶或复方托吡卡胺滴眼液),再进行验光,也就是俗称的散瞳验光。

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