Basically,
If you, or anyone is working around an intense UV source, such as a welding arc, then you NEED to be wearing saftey glasses. Period. The propagation on electromagnetic radiation operates on the inverse-square law: square the distance=1/4 the intensity, meaning that Venus is at the temperature of molten lead, Earth is comfortable, and Mars is freezing, considering the respective distances from the sun (Sol). The same is true for all electromagnetic sources, be they visible, infra-red, UV, gamma or x-ray. The physics is the same.
Hope this helps
Dale simonds