I don't have cataracts, but my vision is not what it used to be and I get impatient waiting for my eyes to adjust to near-focus.
I picked up a
clip-on magnifying glass online, removed the clip once I saw how weak it was, and screwed in a
magnetic base I bought at a local hardware store. Total cost about fifteen bucks.
Worked well enough that I now have one stuck to the lathe compound, one on the mill quill housing, one on a mild steep bar bolted to the shelf above the workbench (to hold magnetic things), and one on the grinder.