I've tried those spectacles-loupe things and, personally, can't get on with them. Can't seem to adjust them to my eye centres.
My near-sight has got quite poor (compared to what it used to be) and I need to wear glasses for nearly all reading.
Trouble is, some things are small and I then need to magnify.
I did buy one of those head bands with lenses stuck on the front, which helped with soldering and the like, but I still have to stare at a vernier or mic for a bit to make sure I see it right before I read it.