Walkabout has it right there. It is standard practice in Mexico and CA too for small weldshop workers to just hold a #10 glass in front of their eyes. Heck , some don't even do that- they get their electrode lined up and close their eyes for the short stitch welds when making light stuff like doors and window frames, seen it lots and lots of times. The more professional types do use proper welders helmets.
Just using the #10 lens alone does stop direct eyeball radiation but does little to prevent eye injury from reflected arc rays. Eventually this will catch up to them. And of course skin burns .
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