When items of equipment for eye and face protection are worn simultaneously, they may be incompatible owing to their dimensions and/or the physique of the user. This may impair the protection against specific hazards (DGUV Regel 112-192 (to date: BGR 192) governing the use of eye and face protection, July 2001, current version February 2006, Section 3.2.2.2 and 3.2.3.1 at www.dguv.de/fb-psa, in German)