Pointer Metal
Pointer Metal
Dangers of a Laser Pointer?
Im a pretty nervous guy, and I really don't wanna screw up my eyes. So today I got one of those cheap pen laser pointers. There fun to play around with one. But I was think that everytime I hit something metal with it, I have the Laser directed into my Eye. Its for a very miminal time, and Im not sure If this can damage my eyes. I was also thinking it was a pretty cheap one, so maybe its not as strong? And another thing is If you look at the point where the laser is, can that damage your eyes too? I mean where I point it it's a pretty Bright Light. If anyone could help me with this That would be great.
thanks
According to my research, some laser pointers are safe--up to a point. Reassuring, isn't it?
The majority of the laser pointers used in the U.S. are Class 3a diode lasers in the 630-680nm wavelength (translation: your garden-variety Red Laser), with a maximum output of between 1 and 5 milliwatts.
Here's where it gets a little tricky. The FDA has determined that Class 3a lasers could cause injury to the eye if viewed directly for approximately 0.25 seconds. You'd think this would be enough to ban them, but the FDA cited evidence that exposure to visible lasers is "usually" limited by the blink reflex of the eye, which they have timed at just under 0.25 seconds. Quite a coincidence, I'd say. Be that as it may, the FDA has issued a warning that the pointers aren't toys, shouldn't be used by children except under adult supervision, etc.
Others have taken firmer action. The U.K. has banned the sale and use of all but low-powered laser pointers, and many school districts in the U.S. have banned them as well--here's a news account of a kid who used one to hurt a teacher.
Damage can include, but is not limited to, flash blindness that can last for minutes, partial vision loss that can last for months, permanent damage to the retina, and loss of life if the police officer who you are pointing the laser at thinks that she/he is being targeted and decides to shoot you in self-defense. (I exaggerate only slightly--there have been reports of officers who drew their weapons after mistaking the laser light for a gun sight.)
Now, to add to this, I've got some good news and some bad news. First the good news: Most lasers manufactured before 1993 were Class 2 lasers with a power output of less than 1 milliwatt, which would make them somewhat safer than the ones put out today.
The bad news? More powerful laser pointers have recently been imported from Russia and China. These lasers emit a green beam, and have emissions significantly exceeding the maximum permissible exposure. One of these lasers was found to have a removable filter. When removed, this laser pointer had an output in excess of 15 milliwatts, which would make it a Class 3b laser.
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