FWIW My issue with welding has been with seeing and controlling the mig weld puddle with aging eyes. Using clean magnifying helmet lens and clean single vision eye glasses is a big help. For me the remaining problem was seeing the puddle due to the bright light of the arc. I mistakenly thought that a lighter lens would help when in fact it increased the brightness. No surprise there. The answer for me was to use a darker lens which toned down the brightness and allowed the puddle to become visible and controllable. btw I don't use self darkening lens.