Because this was a fake Rinnegan created by Edo Tensei body. His entire body was revived into the living state via Rinne Tensei, but since these were fake eyes and his actual Rinnegan eyes were still somewhere else (the left eye was owned by Obito and the right one was hidden), it left Madara without any eyes at all until he got them back again.
(Edited by Ravenlot 27)
Thanks. But why Obito use only one eye?
(Edited by Kjubi)
Because Obito himself explained to Sakura that he intended to use the right Rinnegan too, but was almost overwhelmed with the power of a single left eye and decided that two eyes would be too much for him to handle.
(Edited by Ravenlot 27)
Oh, okay thanks
(Edited by Kjubi)
If madara used izanami to escape from hashirama and activated only one rinnegan why does nagato have two
(Edited by Yaamin645)
Since nagato got it from madara
What do you think?