Board Thread:Theories and Speculation/@comment-25132842-20180312025951/@comment-734582-20180312071403

Erich Zann III wrote: How the hell that works, I don't know, but whatever. Obito has a regular MS but doesn't go blind despite spamming Kamui. He also has Hashirama's cells. The implication is that the eye goes blind due to damage from the jutsu it casts.

If each MS has a unique flaw that causes this damage, then transplanting eyes could indeed fix the problem since the user's flaw would be different from the eye's flaw. In essence, the damage normally caused doesn't occur because it happens in a non-flawed part of the eye, and so it can withstand the strain placed on the eye.

It has to be a close relative because of the transplantation part.