The eyes are the most direct and effective organ for humans to perceive objects, but humans are not only reliant on their eyes for perception.
After all, Michael is a cultivator.
The Dragon Tortoise said that human cultivators at or below the Break Void stage cannot see the "Spring Thunder Sword," yet it's still possible for them to become its master!
Upon hearing this, Michael contemplated. Even before he could gather his thoughts, Yan Zi Yu walked over and voiced out Michael's scattered thoughts.
"If our eyes can't see it, we should use other methods to sense its presence! Once we sense it, maybe we could become its master!"
As per Buddhism, humans have six desires, which refer to the mouth, nose, eyes, ears, body, and mind.
These six are the human ways of perceiving the external world, with eyes being just one of them.
If the eyes can't see it, try using the other five methods.
If all five methods can't sense it, then try to mobilize all senses and try sensing it together.