Cold Laser Classifications

Lasers, including hot, warm, and cold types, are classified according to international standards outlined in IEC 60825. The classification system is based on the potential for eye damage, with higher classifications indicating greater risk. Class 4 lasers (typically over 500mW CW per beam) pose the highest risk of eye damage, while Class 1 lasers are considered safe with no risk of eye injury, despite being lasers.

In cold laser therapy, the power level plays a crucial role in treatment effectiveness. However, a higher class laser doesn’t necessarily equate to better outcomes. Typically, higher-class lasers:

• Are more expensive
• Offer shorter treatment times
• Can deliver higher dosages for more effective results

To enhance safety, many high-power lasers use optics that spread the beam over a larger area, usually between 10 and 30 degrees. This beam divergence helps to create a larger treatment area, ensuring even energy distribution and reducing eye risk.

Some manufacturers use multiple laser beams arranged in an array to achieve higher total power while minimizing the risk of eye damage. For example, an 18-watt Class 3b laser can deliver energy quickly but with a lower eye injury risk.