Board Thread:Naruto Discussions/@comment-24373005-20140811055011/@comment-5407586-20140812085012

ZangetsuGrave wrote: If that's true then how'd did Kakashi know of Itachi's vision getting worse? If Kakashi never saw Susanoo or to his knowledge if Itachi even had it. Just saying lol I'm not saying that only Susanoo causes blindness, it's just the one power that has the heavier toll on the Mangekyo Sharingan. Kakashi knew of Itachi's worsening vision because he himself was starting to get blind by using Kamui, though the effect was very minimal at the time.