Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-25442883-20160430212932

Could Susanoo be the main reason for becoming blind (note that i said main, not only)? It can also explain Obito's case. What i mean is that set of abilities (besides susanoo) mangekyo user gains are less taxing on the eye than susanoo itself. Just developing process to armored susanoo put a lot of stress on body and thus on eyes, and if u use it a few more times a vision became affected ...