Board Thread:Versus Debates/@comment-26388300-20160301040622/@comment-26636534-20160321192642

^The simplest way to remove sight with genjutsu, would be to block signals(chakra) from the brain to the eyes. It would be harder to "cloud" vision by altering signals in stead of just stopping the signals in the first place. BoD is described as negating sight, and negating means stopping or blocking. Which in turn means blocking the signals from the eyes that the brain interprets as sight.

Sasuke has only been shown to combat genjutsu with his Sharingan, without it he will definitely have a harder time countering it.