The welding arc generates a load of ultra violet light as well as infra red. Both the IR and the UV cause of eye problems for welders and can lead to permanent blindness. There are some welding eye glass filters that have a sharper UV and IR cut with the intention of providing the welder with some vision prior to the arc being struck. These would give a greenish view BUT make sure what you have is suited to your intended use. However as you only get one chance get the correct filters from a reputable source and keep the receipt!
You also need to be aware that there are special lenses for uses other than hand welding so you are right to be cautious. (Inspection windows in automated machinery for example.) Get the right filters for the work you are doing including the arc power / materials and operating distance as the filters are cheap.
This document might help http://www.marcosta.com.pl/katalogi-...t-spawarki.pdf Table on page 84 might be of interest re choice of filter.
Regards - Pat