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There is a Naruto character named Tobi who maintains his eyesight though his
special ability _should_ have caused a great amount of macular degeneration.
The following includes extensive spoilers.

> By my math, Tobi possesses his Mangekyo for quite some years. It _is_ his
> Mangekyo, he stated it himself. So in that case, how come he hadn't gone
> blind yet? Itachi went almost completely blind in under 10 years. Sasuke got
> half blind in less than 1 year (because he abused it freely).

So how come Tobi hasn't gone blind? As far as I can figure:

> He obviously replaced his other eye, but it was kept behind his one-eyed
> mask for a long period of time, he didn't use it for vision.


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naruto
Why isn't Tobi blind yet?


When Tobi is not yet revealed to be

> Obito Uchiha

, it's shown that he's collecting Sharingan-Eyes. So it would be logical, that
he took two of these eyes to not go blind.

> Remeber: Tobi was actually angered when he saw that Danzo sealed the
> Sharingan of Shisui, because he couldn't use it anymore.


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This answer contains lots of spoilers so I might as well make one block, edit
if you will

> When Madara rescued Obito from the collapsed cave he used Hashirama Senju's
> living clone to heal Obito's crushed body. Not only did this heal Obito's
> body but it also gave him access to Hashirama Senju's abilities, the wood
> release ability, as seen when he defeated the ninjas who wanted to steal
> Rin's body. Now Hashirama Senju had unique medical ninjutsu which healed
> himself without forming any seals whatsoever. So if Obito gained access to
> the wood release ninjutsu he may also gained this medical ninjutsu, which in
> turn healed his eye throughout the years.


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