Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-28152495-20160407173809

Sasuske's eyes are not yet eternal mangekyou. for a person to have eternal mangekyou. you have to take another mangekyou sharingan since madara and his twin brother both have mangekyou which madara took from his brother and combined it with his own he now possesses eternal mangekyou. Sasuke didn't have mangekyou when he fought itachi. he obtained his mangekyou when he had placed itachi's eyes on himself. that's why everytime sasuke uses the power of his sharingan his eyes bleed.