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I assume you mean if someone points a laser pointer directly at a camera. Several things can happen. The small point of high intensity light can saturate the CCD elements at that location, and even spill over into adjacent pixels (called blooming). An analogy: If you touch a pen to a piece of paper, it just makes a dot. But if you dump the entire cartridge at that point, it spreads and covers the area.

Auto gain/white balance may cause further distortion as the camera tries to adjust to the new brightness level.

Generally, this effect is short-lived: the CCD refreshes, and the over saturated cells empty and it returns to normal. However, a more powerful laser pointer could potentially cause permanent damage to the camera, literally burning the camera sensor.

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