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I've been thinking about his Mangekyo and how it seems to have had no impact on his eye sight and how he could have escaped the effects. After much thought on the topic I think I might have the solution and am wondering if this is a valid theory or not. My theory is you need both Mangekyo to hurt your vision. Since he had only 1 eye this effectively allows him to use part of its power for no effect compared to people like Itachi and Sasuke who do have both and had issues with this. Basically if I didn't make it clear enough with only 1 eye he couldn't get Susanoo or the other great abilities but also didn't have the downside of losing his sight. So do you think this is a valid theory? I know its unprovable either way just trying to see if I'm the only one who thinks this is a possible solution.

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    Very closely related – Wondercricket Sep 1 '17 at 22:20
  • I always thought it was because he doesn't use both at the same time like other people, so it would make the eyes last longer. It's only my theory though. – Akira Mahisaseru Sep 2 '17 at 22:09
  • he had access to lots of sharingans that remained from the uchiha massacre, assuming changing the eye does not take away the original abilities of the user, i'd say he had other eyes implanted in his. – Henjin Sep 3 '17 at 6:52
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    @Wondercricket Wasn't Kakashi starting to lost his eyesight during the 4th Ninja War near the end (don't know exactly which fight)? I thought Tobi/Obito could use his MS so extensively because he has Hashirama's cells. Just like how Danzo, thanks to Hashirama's cells, didn't have to wait a decade before he could use Kotoamatsukami (Shisui's MS) again. – Gravinco Sep 4 '17 at 9:06
  • Kakashi was indeed starting to lose his eyesight, almost from the beginning. This is how he knew to ask Itachi about his eyesight, which instantly alerted and shocked Itachi that Kakashi had developed Mangekyou, even though he didn't use it in that fight. There is only one possibility with regard to why Obito didn't lose his sight, despite overuse. Hashirama's cells. We've seen the effect of Hashi's cells revitalizing the Sharingan's ocular powers within Shisui's Mangekyou. It stands to reason that it's possible that it would have a similar effect in staving off Sharingan blindness. – HyperNym Sep 9 '17 at 4:18

Considering he have hundreds of spare Sharingan and half body of white zetsu. It is quite easy for him to maintain Mangekyu Sharingan (can never actually use eternal mangekyu).

We can see that in the scene when he transplanted Itachi's eyes to Sasuke.

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it is due to Hashirama's cells, plus I have always been under the believe that any Uchiha and Senju/Uzumaki pairing would negate any of the physical side effects of the sharingan due to being of the both the physical and spiritual sides of the sage.

it could also have to do with the fact that with one eye missing he can not use susanoo which might have been damaging and intense enough to overwhelm the healing abilities of Hashirama's cells.

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I could think of two things:

  • He was the owner of that Sharingan. He had more compatibility with it. So he can use it more number of times than Kakashi.

  • He had Hashirama's cells.

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