由华东地区初中物理教材编写协作组编写的九年义务教育三年制初级中学试用课本物理第一册第147页有这样一段话:“想一想:根据凸、凹两种透镜对光的作用,患近视眼的人应配带哪种透镜的眼镜?远视眼呢?”要回答上述问题,第一必须弄清眼睛的构造及各部分的作用。如图一所示,眼的最外层是坚硬的巩膜,起着保护作用;巩膜的前面部分是透明的,叫做角膜,光线能透过角膜进入 The ninth-year compulsory education for three-year junior high school written by the cooperation group of the junior middle school physics textbook in East China is in the first volume of the physical textbook. Page 147 There is such a paragraph: “ Think about it: According to the convex and concave lens to the light What role do people with myopia should wear? What kind of lens glasses? Farsighted eyes? ” To answer these questions, the first must understand the structure of the eye and the role of each part. As shown in Figure 1, the outermost layer of the eye is a hard sclera, which plays a protective role; the front part of the sclera is transparent, called the cornea, and light can enter through the cornea.