There have been studies that have proven that the green lasers are more dangerous than red.
It's simply because the eye is more sensitive to light frequencies in the green/yellow range.
(that could/ probably DOES differ greatly in animals - I don't know)
So green is definitely more dangerous to humans. But add on top of that there are a lot of illegally imported green laser pointers with power levels way over what is considered safe.
Any laser can be harmful depending on the length of the exposure - stare directly into a red pen laser for an hour and it'll probably do permenant damage too.
Any time you see an after image from a light, you have at least caused some very minor "damage" -but it generally goes away in about 10 minutes.
If it lasts into days and weeks, you've definitely caused some more severe damage - but that hopefully will go away as it heels.
But if you got a good blast of green light from one of those illegal lasers (depends on how powerful) it can cause permanent damage.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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