US Forge 99904 Bifocal 2.00 Diopter Welding Lens 2-Inch by 4-1/4-Inch Bifocal 2.00 diopter welding safety lens Provides uncorrected vision in the upper viewing field Allows correction for presbyopia in the reading segments These high quality welding lenses offer the finest, most complete eye protection available Measures 2 inches by 4 1/4 inches