Board Thread:Naruto Discussions/@comment-3568954-20140803003603

so far the IT has been said there is only 1 way to get the eternal mangekyou sharingan and that is by transplanting another persons sharingan into your eyes and only if they are a brother or someone as close in relation as a brother.

but i speculate there is another way but before i address the other way.

we will talk about why the uchiha go blind from over use. it is simple indra, inheriting his father's eyes, his powerful chakra, and spiritual energy but with that being said he did not inherit his fathers body, life force, and physical energy and as such the uchiha do not have the proper body life force and physical energy to contain the true power of the sharingan. and as such it is likely that those born of senju blood would instantly have an Eternal eye if they gained the sharingan  