Board Thread:Theories and Speculation/@comment-28323245-20170530200422/@comment-734582-20170531190217

Lorenzo.r.1st wrote: ok, so my theory was right then. It's not 100% confirmed. However, Madara's eyesight was restored with his Rinnegan, and Kakashi's MS did become blinded by use. So i don't really see any other way than "the eye gets damaged and Hashirama's cells heal it".