The reason madara went blind xD

[Aomine]

As we all know Madara is blind at the moment, when he sees Sasuke hes gonna be all like "Izuna!?" Then Orochimaru will step in since he has been real villain in the narutoverse all along xD hes gonna do some sht and take over someone xD

 

[Legendary Uchiha K9999]

The Reason why he is Blinded Because

He transplant the Rinnegan to Nagato so the real him already given his eyes away Long time Ago...

So when he been revive and became real

the Reanimation Edo Tensei does not give him the original power of his fullest...but I could be wrong about the reanimation thingy suppose to make you at your peak...I guess