Originally posted by: AssertnFailure
Is that what it said? Considering how small the range of visible light occupies with respect to the spectrum, I'd imagine that a shift from one color to the next would be very minute.
Colour vision is a bit complicated issue. And if you watch the laser in the dark, you have to add the effect of the night vision. If you have a look at this picture (I don't want to leech it, so click the link), you will notice two things: The colour we perceive as pure red has a disadvantage of being somewhat far from the absorption maximums of the different types of cone cells we have (used to perceive coloured light). And it's also easy to see why green is seen so strongly, like KitKat said. It's not only absorbed by the green cone cells, but by the red as well, and strongly, generating a high signal.

The picture also shows the absorption spectrum of the rod cells, used solely in night vision, and as you can see, it doesn't really absorb red that well. However, it's right there for green light. Well, of course this also explains why red light doesn't impair your night vision...