42 C.F.R. § 84.199
Facepieces, hoods, and helmets; eyepieces; minimum requirements
Facepieces, hoods, and helmets shall be designed and constructed to provide adequate vision which is not distorted by the eyepieces.
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Facepieces, hoods, and helmets shall be designed and constructed to provide adequate vision which is not distorted by the eyepieces.