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眼睛是一个天然的光学仪器.它像一架结构精巧的微型照相机.眼的外型呈球状,俗称眼球,眼球结构(如图1),眼球最外面包有一层坚韧的膜,其中前面部分透明,称为角膜.其余部分是白色不透明的,称为巩膜.巩膜内壁为视网膜,视网膜上分布着感光细胞,巩膜与视网膜之间为黑色的脉络膜,使眼球成为一个暗室.眼球内部接近角膜处有一个水晶体,它的外形如双凸透镜,水晶体前面有一层带颜色的不透明膜
The eye is a natural optical instrument. It is like a compact micro camera. The shape of the eye is spherical, commonly known as the eyeball, eyeball structure (Figure 1), the outermost bread of the eyeball has a tough film, and the front part is transparent. , called the cornea. The rest is white opaque, called the sclera. The inner wall of the sclera is the retina, the photoreceptor cells are distributed on the retina, and the choroid between the sclera and the retina makes the eyeball a dark room. The inside of the eyeball is close to the cornea. A crystal, its appearance is like a lenticular lens, and there is a colored opaque film in front of the crystal.