Dumb bell,

Get your eyes checked. I was doing the same thing reading, going over and over some words and couldn't stay on the correct line easily at times. My left eye was wandering around independent of my right eye which was looking where I intended. When it became to much I would let everything get fuzzy to take a break.

I knew this was happening but had no idea it was my eyes

Since therapy my eyes are working together much better now and I don't reread things, unless I chose to.

Bud