天气预报 > 其他 > sca视力标准s多少正常
sca视力标准s多少正常
更新时间: 2020-10-31 00:00:00  

儿童sca视力正常范围:3-4岁时0.4-0.5为正常,学龄前0.6-0.8为正常,一年级以上就应该达到1.0(5.0),具体应根据孩子发育情况而定。

S代表球镜(单纯近视或远视),C代表柱镜(散光),A代表散光的轴位。S和C前面是加号代表远视,减号代表近视。在大多数情况下,视力下降和光线不佳(太亮或太暗)有关,特别是在用眼强度很大的学习、工作和生活中环境光线照度不合适。

关键词: sca 视力 标准 多少 正常

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