LASER is an acronym which stands for Light Amplification by Stimulated Emission of Radiation. The laser produces an intense, highly directional beam of light. The human body is vulnerable to the output of certain lasers, and under certain circumstances, exposure can result in damage to the eye and the skin. Research relating to injury thresholds of the eye and skin has been carried out in order to understand the biological hazards of laser radiation. It is now widely accepted that the human eye is almost always more vulnerable to injury than human skin.
In order to regulate laser safety, the Center for Devices & Radiological Health (CDRH) classifies lasers into different categories based on wavelength and output power: