Glad you got the okay for sewing.
I'm also legally blind. I sometimes uses a magnifier which looks like a short welder's mask. It's available from craft stores.
If rotary cutting becomes troublesome, try using scissors while seated. I do that often.
After a botched abdominal surgery, I alternated sewing with knitting. Knitting didn't stress my torso or cause me to hunch over.
Good luck with your recovery.