I think Pentaxuser got it. I used to build a lot of electronics, and could always read the little print on the sides of the tiny parts. Now I can't focus that close with my eyes.
The magnasight works by projecting an image onto ground glass, and then there is a lens that magnifies your view of the glass. I don't think there is any adjustment possible. But when I look through a magnifying glass, there is some interaction with the focus of my eyes ( by moving the lens closer or further from my eye, I can achieve focus or not. ) So there is dependency here on my eyesight being able to focus at whatever the effective focal distance is. Too close is going to be a problem!
I'm due for new glasses soon anyway and might talk to the optometrist about this. I know last time, we figured out that it would be different glasses for reading or for using the computer. Right now I don't have glasses for close yet... seems like that's about to change!
Once we get this sorted, we can work on reversing all the other things. ( Actually... I think making photographs and having fun with it probably helps in that area too! )