A terrifying class III 450nm 0.5 watt laser.
I have these goggles that block out the correct frequency (in theory), but I don't trust the cheap Chinese laser that it isn't noisy. I tried it out and while I'm not blind, I still wonder what I was thinking when I ordered it. I guess I bought it because I could.
If you get a green one (~500nm) you can use it as a pointer to show stars in the sky to others.
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