300mW Laser Systems Second
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For visible-light lasers, the primary eye injury mechanism is thermal. Visible light goes through the clear lens where it is absorbed on the retina. If the power is too strong, and the light stays in one area long enough, heat cannot be carried off by blood vessels, and the retina will start to burn.
What power would it take to be a potential hazard? A 499 milliwatt laser — the most powerful Class 3B laser — is a diffuse reflection hazard if you aim the visible-light laser “dot” at a piece of white paper, and your eye is within 5 inches (12 cm) of the dot and you stare at it for more than 10 minutes. Keep in mind the laser beam is not going directly in your eye. The light is bouncing off a piece of paper or other non-reflective surface that spreads out the light in all directions.