Jul. 22, 2024
Even though the beam coming out of a laser level has only a small amount of power, it is concentrated enough to harm your eyes. Anyone using a laser level should follow the below precautions:
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Class I Lasers are usually under 0.4 milliwatts (mw) of power are considered incapable of damaging skin or tissue and are exempt from most controls. Examples are a scanner at a retail outlet, CD players or laser printers.
Class II Lasers are visible to the human eye, although they are still very low power, below 1.0 mw. When the eye is exposed to a Class II, it blinks, offering adequate protection. If exposed continually over time, eye damage could occur. An example is a laser pointer.
Class IIa Lasers on the other hand, are not intended to be viewed and exposure for more than 3 minutes or so (1,000 seconds) over an 8-hour period, may result in injury. An example is a bar-code scanner.Class III Lasers is where most quality Laser Levels will fall
Class IIIA are intermediate power lasers between 1 - 5mw.
Class IIIB are Moderate power lasers; 5-500mw, specific controls are recommended.Class IV Lasers are high power lasers, 500mw, are hazardous to view under any condition.
All laser light beams carry energy and heat. And the more concentrated and powerful the beam of light, the more heat it transmits. They are also more dangerous the shorter the pulse&#;s duration.
* Small, highly focused beams of light go right through your cornea and lens, which focuses the light even more, so it hits a tiny spot on your retina, destroying photoreceptor cells. This causes a temporary or permanent blind spot before you can blink.
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* Powerful lasers in the visible to near-infrared spectrum (400 to nanometers) heat your entire retina.
* Your cornea absorbs laser beams with a wavelength of under 300 nanometers and beams in the high infrared range, which can inflame them, called photokeratitis, or more seriously burn them.
* Your eye&#;s lens absorbs laser beams with a wavelength of under 400 nanometers, which increases the risk of cataracts. That clouds your lens, blocking your vision.
* A wider laser beam can cause momentary flash blindness just like any other extremely bright light when it shines directly into your eyes before your blinking reflex can work.
* The human eye cannot see infrared laser light. Therefore, such a beam can damage your eye without even triggering your blinking reflex.
* Some lasers are so powerful they damage your eyes even though after something has diffused the beams. Even in that weakened state, they cause damage. Some laser beams, typically closer to blue or ultra-violet on the spectrum, cause damaging photochemical reactions in the tissue of your eyes.
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