​Intended for application both by users and by manufacturers of laser products, and details procedures and requirements designed to protect persons from laser radiation which indicate safe working levels of optical radiation, classify lasers according to their degree of hazard and set out detailed protective and control measures appropriate to each class. A statement on the effect of laser radiation on biological tissues is given in an appendix, and other appendices cover maximum permissible exposures, calculations, a medical surveillance chart, and design of warning labels and signs.