In the studio, when I saw the flash, my eyes were all black. It took a while to see clearly. What happened?

When the strong light of the flash flashes, our pupils will shrink protectively to protect our eyes, just like the aperture of the lens is narrowed, which can prevent the light from entering at the same time.

The bright light flashed by, and our pupils were still in the state of narrowing just now. At this time, the normal light in the room is obviously insufficient under the condition of pupil contraction, so we will feel darkness in front of us. After a while, the eyes will adjust themselves with the intensity of light. When the pupil is slowly enlarged back to its original normal size, we can see clearly what is in the normal indoor light again.

This is the same as staying outdoors in the sun for a long time and rushing into a relatively dark room.

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On the contrary, in a dark environment for a long time, the pupil will be dilated to increase the amount of light. At this time, if there is sudden light, even normal light, we will feel very dazzling until the pupil returns to normal size. For example, suddenly turn on the light in the middle of the night, and your eyes can't open. That's why.