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Audience scanning (sometimes called „crowd scanning“) occurs when a laser beam is directed toward the people observing a laser show or display. Although this is preferred for many laser effects such as tunnels, it is potentially dangerous due to the high levels of laser radiation exposed to the eyes of audience members.
Laser effects involving audience scanning are created by scanning the beam very rapidly across the audience, ensuring that the net exposure to any one eye is very small. Should the scanning mechanism fail, however, it is possible to expose people to laser light at levels that may produce eye injury.

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