What can eye-tracking say about text interpretation?

The fish is ready to eat.

Are you going to feed it or have it for dinner?

And while you are thinking how both alternatives are equally possible, your eyes have already come back to the start and re-read the sentence. Perhaps even several times. But how does revisiting impact text understanding and what eye-tracking can tell about it? This is what German mathematics educators and psycholinguists checked by an experiment.