Regulatory requirements are contained in 29 CFR 1910.133. Each affected employee:
A. When Required: Shall use approved eye and face protection when exposed to hazards from flying particles, molten metal, liquid chemicals, acids or caustic liquids, chemical gases or vapors, or potentially dangerous light radiation.
B. Side Protection: Shall use eye protection that provides side protection when there is a hazard of flying objects.
C. Prescription Lenses: Shall wear prescription lenses while engaged in operations that involve eye hazards. Employees shall wear approved eye protection that incorporates the prescription in the design, or eye protection that can be worn over prescription lenses without disturbing the proper position of the prescription or protective lenses.
D. Filter Lenses: Shall use equipment with filter lenses that have a filter number adequate for the work being performed for protection from injurious light radiation. The usual recommended lens shade for electric arc welding is 10, 11 or 12 while the usual recommended lenses shade for oxy-acetylene is 5, 6 or 7.
E. Manufacture Identification: Eye and face protective equipment shall bear the manufacturers' identification mark. (2019 Compilation)