Human Resources
Human Resources
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Laser Pointers20. (1998)Laser Pointers are becoming more and more common in lectures and presentations to indicate an area on a projection screen, blackboard, or similar. It is difficult for many people to believe that a device that looks like an ordinary pen-light and runs on a couple of AAA batteries can be dangerous. However, within the device is a small yet power laser diode. Laser pointers are commercially available as Class 1, 2 or 3A lasers. Laser classification gives an indication to their degree of hazard. At one end of the scale, class 1 lasers are safe for normal viewing, while at the high power end, class 4 lasers are extremely hazardous to the eye and skin (either directly or by a reflection). Eye damage is usually avoided with a class 2 laser by your blink reflex or aversion response. A class 3A laser pointer has the potential to cause eye injury, especially in the hands of an unaware, untrained, or careless operator. The resultant injury can range from temporary flash blinding (similar to a visual after image) to a slight retinal lesion. That is why in Australia, laser pointers shall not exceed class 2 (section 11.5 of AS 2211.1:1997). Laser pointers should be handled with respect, since their associated hazard, although low is not zero. The beam should never be intentionally aimed at people. Laser pointers of Class 3A or above, should not be used within the Australian National University. Additional information is available in the Australian Standard or NHMRC publications, or from the OHS Unit. The OHS Unit conducts regular Laser Safety courses. References:
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