I've seen laser toys for made for cats. They chase the dot like it was a piece of string.
I can't imagine something powered by a couple of AA batteries could cause such a problem.
I can't imagine something powered by a couple of AA batteries could cause such a problem.
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The cat toy lasers are class II red diodes running at one or two milliwatts, at most five. You can power quite a laser with AAs- the green lasers are "diode pumped solid state frequency doubled" (DPSSFD) lasers that can crank out up to 40 mW or even more, though battery life is poor.
Because the green light is much closer to the sensitivity of the eye, they will look (to the eye) to be twenty times brighter than a red laser.
So if you figure the 5mW green pointer laser has twice the power and your eye has twenty times the sensitivity, the DPSSFD laser will appear to be fourty times brighter than the red "cat toy"- capable of causing much glare and dazzle in your eye but probably not any permanent damage.
If you get one of the boosted DPSSFD pointers, the power can be 40 mW- very very bright and still running on AA cells.
I have an ultraviolet LED light that runs on two CR0232 cells (button cells) that came with a stern warning about eye damage- although the light appears to be dim to teh eye, there's apparently 500 mW of 370nm UV coming out of the LED, enough to cook my corneas if I'm not careful.