The “mini movements” are beyond control and barely noticeable, like reflexes. Whether you train yourself to recognize sight words or not, without those movements, you can’t see. It’s a matter of neurology and how the brain works (I had a class including this type of material).
If you ever look at someone who’s daydreaming, you’ll notice their eyes are unusually still. By cessation of the movement you are left with your “mind’s eye” and only see what you “think”.
It's kind of like stepping back and taking in the whole picture instead of just one piece of it.