I've used an auto-darkening helmet since 1998. I left it (secured) at a jobsite and today I had to tack something together. I have an old helmet and tried welding the old way, with the chin wag to drop the helmet. After ten years of no practice, that was nearly impossible! I wound up tacking it together with my eyes shut. They were just teeny MIG tacks, doubt it will do anything bad.
Grant