Devices and apparatus for protection of the human eye against radiation, namely, protective goggles, visors, shielding in the form of welders' masks and protective clothing, safety screens, hoods and helmets, all of the foregoing particularly for welders; sunglasses; optical filters, namely, absorption filters, interference filters, reflection filters, infrared filters, UV filters, polarization filters; optical filters and sets of transmittance controllable optical filters; automatic control ...