As we all know, the sharingan allows the user to track movements of extremely fast enemies to the extent that they almost have a precognitive ability of seeing what their opponent is going to do.
Now, if you've ever seen a movie, then you know each second is made up of frames that move so fast your eyes can't physically process each frame individually and so they are all blended together to make it seem as if the movie is happening in real time. These frames move at 24 frames per second which means that each frame is put on screen for 1/24th of a second. Each second on screen uses 1.5 feet of reel for every 24 frames. Which means that anything moving at a speed of 1.5 feet per second is indistinguishable to the human eye.
Naruto as we also know, is now the fastest character in the manga, and probably the fastest character in the entirety of the world. [Naruto can move at speeds faster than Minato Namikaze's Flying Thunder God which is described as being near instantaneous (let's call it light-speed for argument's sake). The speed of light is approximately 989,315,111 feet/second, 659,543,407 x the speed of which the human eye can perceive.] [EDIT] I have recently been convinced/reminded that Naruto is not faster than FTG. Now, for argument's sake again, let's SAY FTG is the speed of light (which already is a huge compromise seeing as it's much MUCH faster than light). Also let's say Naruto moves even 5000 x slower than light speed. He is still moving at speeds of 197,863 feet/second. Faster than the human eye can make out, which means the scenery naruto is passing by seems to be moving that fast from Naruto's point of view, meaning if he can perceive the scenery around him, his eyes are on par with the sharingan. [EDIT]
When moving at these speeds, it would be impossible to distinguish objects outside of you from each other because of the tunnel effect (even present when kakashi used his chidori for the first time). This could be remedied when fighting characters of an evil nature such as tobi and the tailed beasts due to his new ability to sense evil thoughts and feelings.
However, when using these speeds against opponents such as A, when near hinata, or when fighting characters brought back by the Edo Tensei who are not inherently evil but are being forced to fight against their will, his ability to sense negative emotions would not help in seeing or sensing where these people are.
With that said, naruto must be able to see his enemies and the terrain clearly while in his Nine Tails Chakra Shroud as he cannot use sage mode simultaneously. Therefor, naruto's eyes are AT THE VERY LEAST, on par with the sharingan.
That's all i have to say. I know it's a manga where people can breath fire and walk on water, but i just wanted to point out the science behind Naruto. xd
