The pupil is an important pathway for vision formation, and it directly affects the quality of visual imaging, just like the aperture of a camera. As we all know when taking pictures, when the light is strong, open the aperture smaller, and when the light is low, open the aperture larger, always allowing enough light to enter the camera through the aperture and expose the negative, but not allowing too much light to damage the negative. The pupil also has this function, except that its adaptation to the intensity of light is done automatically. By adjusting the pupil, the right amount of light enters the eye at all times, so that the image of the object falling on the retina is both clear and does not burn the retina with too much light. In some cases, such as acute glaucoma attacks that dilate the pupil, or trauma or surgery that damages the pupil, our pupils may become abnormal and affect the quality of our vision. In some cases, such as an acute glaucoma attack that dilates the pupil, or a traumatic injury or surgery that damages the pupil, the pupil may become abnormal and affect the quality of vision.