What classification do most true lasers, such as ND Yag, Diode, and Alexandrite, fall under?

Most true lasers, including ND Yag, Diode, and Alexandrite, fall under Class IV classification due to their high power and ability to cause significant injuries to eyes and skin. Class IV lasers are capable of causing permanent damage to both the retina and skin upon direct or reflected exposure. This classification serves as an important regulatory measure to ensure safety in the use of such powerful lasers, requiring specific safety protocols and protective equipment to avoid accidents and injuries during their operation.

In contrast, Class I lasers are considered completely safe under all conditions of normal use, Class II lasers can cause damage only with extended exposure (as they typically emit lower power), and Class III lasers can cause injury with direct viewing but are generally less hazardous than Class IV. The higher the class number, the greater the potential for harm, highlighting the need for trained professionals to use Class IV lasers effectively and safely.