Quote Originally Posted by poopdeville
It looks like Madara's eye has the same kind of injury. Notice the dark sclera.

http://www.onemanga.com/Naruto/398/07/
http://www.onemanga.com/Naruto/398/12/
http://www.onemanga.com/Naruto/395/17/

http://www.onemanga.com/Naruto/455/17/
That's only because he's in a dark room. Sasuke's eyes are like that as well in those first two links. And the mask is shadowing it as well.