Sightless Eyes

The Formation Eye Visualization technique had been incredibly useful to Ryu in Sacrum, but here, it wasn't able to sustain the formations of the True Martial World. They were essentially meant to be like portable, self-created formation flags. However, they didn't have the proper supporting Fundamental Runes to work properly in this world.

Ryu hadn't had the skill or the time to improve them to the standards of the world. Even now, he still didn't. Though, it was probably more a function of time than skill now.

So why was he deploying a useless Visualization technique? It was because he was cheating. Each kernel of a Formation Eye was sustained by his Birthed Phenomena and his Founding Dao. Using the much weaker core of the Visualization as a foundation, he was able to trick the Heavens into thinking that it was indeed a Formation Eye that was present.