[commandar]

>I wonder if there's some kind of app to be made for these people, so that text moves around or changes color when their eyes track toward the text.

I really don't think that would help. For me the highlighting is a lot like tracing along text with your finger as you read on a printed page; it gives my eye a visual cue where I'm trying to track.

The issue is that I can read text faster than my eyes can track without wandering slightly and losing my position in the text, so simply tracking where my eyes are looking wouldn't do anything to mitigate that. It'd just end up highlighting where my tracking gets off anyway.