照相机是用来控制照射到胶片上光线的强弱的。
A camera is used to control the amount of light that falls on the film.
光线的强弱对视觉有什么意义？随着年龄的变化光线与视觉的关系又如何？
What effect does light have on vision? What do light and vision mean with age?
由于光圈控制着进入相机的光线总量，也就是说曝光强弱可以由光圈来控制。
Since the amount of light reaching the camera is dependent on the aperture, the overall exposure is altered by changes in aperture.
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