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I recently bought a fairly cheap 405 nm laser that claims to be 10 mW. Thing is, I can see the beam fairly clearly in dark, non-foggy conditions, and it makes a not uncomfortable but still bright spot on the wall. What power does it usually take to be able to see the beam of a 405 nm laser, and...

I've recently gotten into cheap lower-powered lasers, and I'm interested in the limits of human vision. To that end, I just bought a 5 mW 980 nm laser off the Internet. As I understand it, looking directly into lasers of that power for a time on the order of a few seconds should be fairly safe...