写作业要不要戴眼镜?

• 出 处: 中国眼镜科技杂志
• 发表日期: 2015年24期
• 关键词: 作业 晶状体 阅读距离 戴眼镜 人眼 凸透镜 屈光力 眼睛 书写 书本 近视 检查 概念 调节 长假

很多家长假期带孩子检查眼睛,发现孩子近视给孩子配眼镜后,问的最多的一个问题就是:看书写作业时究竟要不要戴眼镜?为了回答这个问题,我们首先需要弄清几个概念。人眼在看近处时,需要调节才能看清书本的字。这一过程由人眼的晶状体直接参与,晶状体好比一个凸透镜,看近时晶状体变的更凸,增加屈光力以使看近清晰。一般来说,人们习惯的阅读距离在33cm至40cm左右。理论上来说,为了看清书本上的字,对于33cm的阅读距离而言,

Many parents holiday with children check the eyes and found that children with myopia glasses glasses, asked one of the most questions is: When reading assignments do you want to wear glasses? In order to answer this question, we first need to find out a few concepts. When the human eye is looking close, you need to adjust to see the book’s words. This process is directly involved by the lens of the human eye. The lens is like a convex lens. When it is seen, the lens changes more convexly and the refractive power is increased to make the lens clear. In general, people are used to reading distance of about 33cm to 40cm. Theoretically speaking, in order to read the words in the book, for the 33cm reading distance,