Board Thread:Naruto: The Last Discussion/@comment-732150-20150205151208/@comment-25632268-20150205232636

Elveonora wrote: It didn't use chakra. Think of the Byakugan as alien eyes.

And now it makes sense why Hinata looks like alien in anime (and the movie, but that because the scene is simply copy - pasted) when she confesses to Naruto before fighting against Pain :D