Lasers

The rapid increase in the use of lasers in healthcare has introduced new challenges. The hazards depend on the characteristics of the laser and the different modes of interaction with tissue. If the laser beam were to strike the unprotected eye, serious damage could occur, the site of damage depending on the wavelength of the laser radiation. The risk is reduced in the case of extended sources but, potentially, may be increased when a repetitively pulsed laser is used. These concepts are all discussed in addition to summarizing current legislation and standards. The laser protection adviser (LPA) is someone who is knowledgeable in the evaluation of risk associated with the use of lasers and has responsibility for provision of expert advice to the user. This chapter contains much useful information for the LPA and others interested in understanding the principles of laser safety.