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人眼睛的构造与功能和照相机有许多相似之处。因此,我们可以把眼睛通俗地比做人体的照相机。但眼睛是有生命的人体器官,比照相机要复杂得多,眼的“摄像”更清晰,更灵敏。用照相机拍摄远近不同距离的物体时,必须相应地改变镜头与底片之间的距离,使光线恰好聚焦在底片上,照片才能清晰。人的眼睛不能改变长度,而是通过改变晶状体形状来“调焦”的。看远处物体时,晶状体比较扁平,看近处物体时,晶状体增厚,前表面向前凸出,如同照相机换了聚焦力更强的镜头一样,使物像恰好落在视网膜上。这就是眼睛的调节功能。借助于调节,我们就可以看清远近不同距离的物体。
The structure and function of the human eye and the camera have many similarities. Therefore, we can compare the eyes with the camera of the human body. But the eye is a living human organ, much more complex than a camera, and the “camera” of the eye is clearer and more sensitive. When using a camera to take pictures of objects of different distances, you must change the distance between the lens and the film accordingly so that the light is exactly focused on the film for clarity. The human eye can not change the length, but by changing the lens shape to “focus ”. Looking at objects in the distance, the lens is relatively flat, looking near objects, the lens thickening, the front surface protruding forward, as the camera for the more focused lens, so that the image falls exactly on the retina. This is the regulation of the eye. With the help of adjustments, we can see objects at different distances in and out.