Transparent, fixed tint glass lenses

A FIXED DYE TRANSPARENT GLASS LENS IS PROVIDED WHICH HAS A THICKNESS BETWEEN APPROXIMATELY 1.0 MM AND APPROXIMATELY 1.8 MM AND IS DERIVED FROM A COMPOSITION OF ALKALINE SILICATE CONTAINING, IN TERMS OF% BY WEIGHT ON AN OXIDE BASE OF 6.2% OF IRON OXIDES, AT LEAST 0.03% OF COBALT OXIDE AND AT LEAST 0.12% OF NICKEL OXIDE IN THE PRESENCE OF AN OXIDIZING AGENT SUCH AS ARSENIC OXIDE. PREFERABLY, LENSES HAVE A TRANSMITTANCE OF NO MORE THAN 1% OF ULTRAVIOLET RADIATION AT 380 NM.