Lamp working glasses can be used to look into the kiln at high temperatures.
Didymium glasses are used by lamp workers to protect eyes against sodium flare – the yellow glow coming off the glass in the torch flame.
In kiln forming, the radiation that our eyes need protection against is infrared. Welders’ goggles do this, but didymium glasses do not. Welders goggles and helmets are much cheaper too.