I have the same problem - can't see. I've used a couple of different magnifiers.
The ones that hang around your neck aren't worth it - they move when you breathe, plus they use whatever light source you're using. Half my problem is poor lighting.
There are floor lamps available, like Ott lamps, with a built in magnifier. Since the magnifier isn't lighted itself, I found these to be pretty useless for me, too. At least they don't move!
My favorite magnifier is a swing arm lamp magnifier. It has a circular bulb under the lens, so there's lots of light and good magnification. It has to attach to a table, however, and since we redid our living room I haven't been able to use it. I think there are stands you can get for these, I just haven't invested. This was also relatively inexpensive - less than $100 at an office supply store.
The one I'm currently using is a floor magnifier lamp, with led lights next to the magnifier. It does a good job, although it could be a bit stronger - the magnification is 1.5 diopters, whatever they may be. Mine was sold through a catalog, and I've seen them in Keepsake Quilting and Nancy's Notions.
If I'm sewing away from home, I just take off my glasses - my near vision is very good without them. So long as I have enough light I can sew.
Hope this helps.
Janet