Itachi's power to naruto....
Now, I've seen many theories on what this power could be (the power which Itachi has entrusted to Naruto). However I think I have come up with a new theory which may... kinda make sense.
Now as we know Itachi was one of the top ninja in the Uchiha Clan, and we know that he is clever enough to see events coming. For example, he was one of the only people who knew that Madara was still alive, and he needed his help to wipe out the clan. He also knew that his brother Sasuke was yet to decide where his fate would turn. As Itachi was his brother, it makes sense that he knows what he would do when he helps give him the MS.
We saw that Itachi also tries to stop Madara from talking to Sasuke, by inserting a Amaratsu into his eye when Sasuke sees Madara's sharingan. This shows he understood that Sasuke could easily be controlled and manipulated by Madara. Unfortunately, this happens and Sasuke becomes a member of Akatsuki.
...but what if Itachi decided to take another step forward? What is he knew that when Sasuke would use his newfound MS too much that he would become near blind too? Itachi knew of the curse which the MS would bring, and Itachi isn't the kind of ninja to give his own brother a risky power like that. Especially if Madara wants to use his power for something big.
This brings me to my theory. I believe that Itachi have Naruto a power which would blind his own eyes when confronted to Sasuke. As Sasuke receives new light from Itachi's eyes, this would mean that he would be able to constantly use his dangerous use of ocular jutsu. Itachi would expect that if Sasuke tresured the powers he claimed at the start he wouldn't have needed to give this power to Naruto, but it is set as a precaution. Even Itachi said to Naruto that "he hopes he never gets the chance to use it", as he can relate to the bond that Naruto has for Sasuke.
What do you guys think?