下午放学回家,儿子骄傲地告诉我:“妈妈,今天学校查视力,我们班好几个同学的视力都下降了,只有我还和以前一样,5.2,是不是很棒?”我对儿子说:“当然,你的视力还和以前一样棒,那你们班最差的是多少?”“最差的那个只有4.7,老师说他近视了。他一天到晚玩电脑游戏,不下降才怪了。 After returning home from school in the afternoons, my son proudly told me: “Mom, today’s school examines visual acuity. The visual acuity of several students in our class has dropped. Only I am still the same as before. 5.2 Is not it great?” I said to my son, “Of course your visual acuity is as good as before, and what is the worst in your class?” "The worst is 4.7, and the teacher said he is myopic, and he plays computer games all day long without any downturn.