Board Thread:Theories and Speculation/@comment-35448581-20160502192848/@comment-734582-20160503075414

Sharingan and Byakugan are two entirely different lines of Kekkei Genkai. It didn't affect the otstusuki's byakugan or whatever you're saying.

Your comparison of Naruto and his eyes is somewhat weird. The same can be said of every single eye: a Sage can sense all around him, why isn't it called byakugan? Kuranai can cast genjutsu, why isn't her eye called Sharingan.

It's because in the end, different things can achieve similar goals. Sage Mode gives the user enhanced healing, but so does Uzumaki or Senju blood and so does Kurama's chakra.

The difference is that some things have been granted a specific name (e.g. Sharingan) while others do not get such mention (e.g. Sage Eyes).