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Leo Lichtman
 
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Default Safe distance to watch arc welding


"Howard Eisenhauer" (clip) the UV is actuually burning the cornea, not the
retina, which is why people get the "gritty eye" pain instead of just going
blind. (clip)
^^^^^^^^^^^^^^^^^^
Howard, thanks for flushing the toilet on all my fancy optical reasoning. I
believe you are correct, and it doesn't matter about the focused image on
the retina. So, since the inverse square law is in effect, the OP's
original question is valid, and unanswered.