Specification for visors for vehicle users|Testing conditions, Optical properties of materials, Eye protectors, Protective clothing, Safety measures, Helmets (protective), Compatibility, Designations, Grades (quality), Marking, Corrosion resistance, Abrasion, Optical measurement, Goggles (safety), Wear tests, Ultraviolet radiation, Environmental testing, Road safety, Vehicle users helmets, Visors, Private cars, Field of vision, Wear resistance, Road vehicles, Mathematical calculations, Diffusion (waves), Dimensions, Specimen preparation, Impact testing, Transmittance, Instructions for use, Test equipment