Now many people like to hold a hand-held laser pen as a toy, this device is also commonly used in lectures and other occasions.
Recently, the US Food and Drug Administration (FDA) issued a warning through the MedWatch system that the laser light emitted by a green laser handheld pointer might be harmful to the eyes, which seemed obvious, but there were still many people who had caused a laser Department of injury.
The reason why the US FDA issued this warning is that some irresponsible parents put a laser pen to the child as a toy, which is a great risk, if the child will focus on the reflective surface of the object, the reflected beam may be more than The beam that was originally emitted was more intense.
Although the visible light intensity of the hand-held laser pointer is limited to 5 mW according to American standards, even under this intensity, the laser's direct exposure to the eye still causes a transient flash blindness. If this happens repeatedly or in the case of laser irradiation Do not blink or can not quickly look elsewhere, there will be the risk of permanent eye damage.
In addition, the FDA has found that some of the sales of hand-held laser pen power more than 5 milliwatts, these laser equipment will bring more dangerous. At present, this handheld laser pen is mainly sold through the network.
So how to distinguish the power of the hand-held laser pen at 5 mW level? This tells the user a little trick, if a laser pen is using a button battery, then its power may be in the acceptable 5 mW range, but if the laser pen is using AA or AAA batteries, it may be illegal sales Product, there are security risks. And, high-power laser pen in the sale will usually use some vocabulary to emphasize, such as strong, super, military, military level, super light, high energy, lithium battery, if you run into the description of the laser pen, Be careful to use, do not give children to play.
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