Laser safety is important and avoiding laser accidents, especially those involving eye injuries, requires the correct protection i.g. laser glass, laser goggle, patient laser protection, laser barrier or curtain, laser window, laser signs and laser safety training. Since even relatively small amounts of laser light can lead to permanent eye injuries, the sale and usage of lasers is typically subject to government regulations.
Moderate and high-power lasers (class 3 and class 4) are potentially hazardous because they can burn the retina of the eye, or even the skin. To control the risk of injury, various specifications, for example ANSI Z136 in the US and IEC 60825 internationally, define "classes" of laser depending on their power and wavelength. These regulations also prescribe required safety measures, such as labeling lasers with specific warnings, and wearing laser safety goggles and other protection measures when operating lasers.