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Re: tanning beds



Is it really true that visible light cannot damage the eye?

The amount of damage that the eye will get if hit by EM radiation depends
solely on the flux that will hit the retina. UV light is more dangerousfor
two reasons. In the first place it has a high frequency and therefore high
energy photons, in the second place wecannot 'see' UV light, therefore our
pupil does not contract when hit by high intensity UV radiation. So UV
radiation is more dangerous, but so is visible light or gamma rays or
infrared, you just need a big enough flux.