To this end, protective glasses must be so designed and manufactured as to possess, for each harmful wave, a spectral transmission factor such that the radiant-energy illumination density capable of reaching the user's eye through the filter is minimized and, under no circumstances, exceeds the maximum permissible exposure value.
Goggles ... provide both top and side protection and are the recommended eyewear where chemical splashes, molten metal splashes, welding sparks and dust pose potential hazards. ... Goggles are made in two basic shapes: eye-cup type and monoframe. Eyecup goggles are those with two separate lenses, usually round in shape and joined at the bridge.
Goggles are of cup type or box type. They are available as dust goggles, gas tight goggles or chemical goggles.
