What does a red laser do to you when it shines in your eyes?

What does a red laser do to you when it shines in your eyes?
Just a while ago i was in the library and my friend picked up the library scanner ( the one that scans the books number) and she shone it in my eyes. She was playing around with it or a while and i didnt notice for a while. I thought nothing of it for a minute but when i got home i started having major headaches. Is this from the laser?? How much power or wattage is in the book scanner?? please help me. I dont know what will happen or something i should do. I feel kind of spaced out and my head hurts A LOT!
Thanks

Best answer:

If you didn’t notice she was doing it at the time it is unlikely to have done much damage. The power output of a scanning laser is pretty low, as is the effective range. Green lasers are worse and have been known to momentarily blind people (but that is MOMENTARILY, not permanently).

Tags: eyes, Laser, shines

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