Class IV Lasers in Physical Therapy
Class IV Lasers in Physical Therapy Laser is an acronym for: L ight A mplification from the S timulated E mission of R adiation Laser Classifications Lasers are classified into four broad areas depending on the potential for causing biological damage. When you see a laser, it should be labeled with one of these four class designations: Class I These lasers cannot emit laser radiation at known hazard levels. Class I.a This is a special designation that applies only to lasers that are "not intended for viewing," such as a supermarket laser scanner. The upper power limit of Class I.A. is 4.0 mW. Class II These are low-power visible lasers that emit above Class I levels but at a radiant power not above 1 mW. The concept is that the human aversion reaction to bright light will protect a person. Class III.a These are intermediate-power lasers (cw: 1-5 mW), which are hazardous only for intrabeam viewing. Most pen-like po...
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