How is Zilong blind?

Zilong has been blind for n times. The first time he played the Silver Saint in Poerxiusi, he poked himself blind in order not to see the petrified light of Medusa's shield. Later, in the Cancer Palace, he recovered his sight because he was dragged to the underworld.

The second time was in seafood, fighting against the sea warriors who guarded the pillar of the Indian Ocean, and was blinded by powerful tricks. When Hades came to the underworld, he regained his sight.

That's it.