This is old, but thought it was interesting nonetheless as it proves these devives are capable of harm:
Phys Med Biol. 1994 Nov;39(11):1765-99.
Ultraviolet and laser radiation safety.
Department of Clinical Physics and Bioengineering, West Scotland Health Boards, Glasgow G12 8SQ, UK.
Both ultraviolet radiation and laser radiation occupy pmt of the Spectrum designated "optical radiation". Thus, measurement techniques are similar and the same organs (eyes and skin) are at risk from accidental exposure. However, the equipment used to produce ultraviolet and laser radiation differs substantially and the harm caused by each type of radiation is also different. Another significant difference arises from the fact that ultraviolet radiation is natural with associated general population exposure. Consequently, the present article reviews the current status of both ultraviolet and laser radiation with the material divided into two sections where each hazard is considered separately.