Just a thought but maybe its set too dark and you are having to strain to see the puddle. The eyes will accommodate, meaning if they have to, the muscles will try to contour the eyeball when you have a hard time seeing. Then when you get back into a normal environment they will relax but it takes time for that to happen. And longer with age. And that goes to the Q about yer age. Yes, around 40 years of age it takes longer for our eyes to refocus. This is coming from my eye doc.
I wouldnt worry about UV light, the helmet should be blocking all of it, even when off, the lens does that. And you will be able to tell if its too bright (not enough shade), it will just look to bright and you will have ghosting, like when you look at a bright light.. I think its an old timers focusing issue. Even if yer not that old.
Welding is a close up visual thing. Kinda like reading a book at 6-8" Try reading a book at seven inches for 30 minutes and see if yer eyes dont focus well and actually feel tired afterwards. Thats the muscles trying to accommodate.
I weld with my face about 8" off the puddle, thats far closer than I can read these days. My eyes would be tired and I would be squinting like gang busters. JR
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