Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-25122992-20160430121824

Lulcielid wrote: I don´t remember if this scenario was ever explained but:


 * In order to prevent blindness from Mangekyo Sharingan, one must implant the Mangekyo from another MS Uchiha user.

This leaves me to question, what happens if Uchiha1 with a completely blinded MS wants to transplant the completely blinded MS of Uchiha2? Will the vision of Uchiha1 be completely restore? I think it was actually explained. Yeah, regardless if the MS of Uchiha2 has gone completely blind or not, the eyesight of Uchiha1 will be restored upon their transplantation. But with this condition of the Uchiha2 eyes' compatibility with Uchiha1 (close blood relative, ideally a sibling, you know). This was proven via Itachi's eyes transplantation to Sasuke - Itachi became blind (or almost blind) before dying, yet his eyes completely restored Sasuke's sight when transplanted to him.