Council Directive 92/58/EEC of 24 June 1992 on the minimum requirements for the provision of safety and/or health signs at work (ninth individual Directive within the meaning of Article 16 (1) of Directive 89/391/EEC)
11.If the hearing or the sight of the workers concerned is impaired, including impairment caused by the wearing of personal protective equipment, measures must be taken to supplement or replace the signs concerned.U.K.