That totally depends on your eyes!
Mine are, let's say, less good than they were [x] years ago. You really need to try some on to see if you're comfortable with them.
At this point, I need 3 different vision aids when working on stuff: 1) my regular reading glasses, 2) a stronger (3.5-4.0) pair of reading glasses for closer-up work, and the visor for really getting in close. It's very annoying having to switch all the time.
The problem with strong magnifiers is that you end up moving your head like a damned robot if you try to find a nearby tool on your workbench. But they're indispensable for working on teensy-tiny stuff.