Board Thread:Theories and Speculation/@comment-1512913-20150116120105/@comment-17623-20150121102910

If they were just normal eyes then that would be fine. They were called Byakugan, i.e: chakra powered white eyes that can see through stuff.

If she had the Byakugan before eating the fruit then she had chakra powered eyes before she even had chakra but that's impossible because she only got chakra once she ate the fruit and oh no I've gone cross-eyed.