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从3岁开始,幼儿近距离用眼的机会就越来越多,比如看电视、小人书、绘画等,持续用眼的时间也会随着年龄的增长越来越长。人的眼球包含晶状体、角膜、虹膜和睫状肌等几个部分,而人的视力发生改变最主要就是晶状体的改变,幼儿处于生长发育的时期,从出生开始,幼儿的视力由只能看近处的一点东西发展到越看越远,但是直至三四岁,他们的视力也才到0．8左右,也就是他们还在发育,还在变化,可想而知,这个时期用眼对孩子来说多么重要。这一时期,幼儿晶状体的弹性比较大,即使是很近的物体他们也能看清,正常人看得太近会产生模糊和眩晕感,
From the age of 3, young children have more and more opportunities to use their eyes closely. For example, watching TV, villain books and paintings, the time spent with their eyes will also grow longer with their age. Human eye contains several parts of the lens, cornea, iris and ciliary muscle, and the main change in human vision is the lens changes, young children in the period of growth and development, from birth, young children’s eyesight can only see the near Things developed to more farther away, but up to three or four years of age, their eyesight was only 0.8 or so, that is, they are still developing, still changing, one can imagine, during this period with the eyes of children How important it is. During this period, young children lens flexibility is relatively large, even close objects they can see, too close to normal people will have a sense of fuzzy and dizziness,