Board Thread:Episode Discussions/@comment-25319479-20180531110046/@comment-734582-20180604152119

BlazeRelease wrote: Ah, so I guess the Rinnegen and the Byakugan are similar in that way, they are just mutated/genetic eyes, while the Sharingan is just a normal/humam eye powered up by chakra, forming as a jutsu, or weopen, a doejutsu. We don't know for sure, but it looks that way. When Sasuke overuses his Rinnegan he is forced to close it, unlike with his Sharingan which he simply retracts when overused. This is not unlike Neji who loses vision when he overuses his eyes, unlike the Sharingan which stays sharp until retracted.