Why Does Kakashi's Sharingan Never Get Tired?


Kakashi has a Mangekyou Sharingan like Sasuke, Madara and Itachi. However, unlike the three of them, Kakashi did not lose sight of his eyes due to the use of the Mangekyou. Let's find out why. 

Kakashi is referred to as the copy ninja. This is because he can use his Sharingan to copy any ninja's jutsu. Kakashi uses his Sharingan very rarely and when he does, he uses it for a very short period. 

This is why his normal Sharingan doesn't tire him out even when he uses it. 

Kakashi's Sharingan was a gift to him by Obito which means he has the Sharingan in his left eye only. He can use the ability Kamui when using his Mangekyou.

 As was mentioned in the anime and manga, excessive use of the Mangekyou Sharingan can lead to blindness for the user and can easily tire them out. 

Sasuke, Itachi, Obito, and Madara all felt the effects of excessive use of the Mangekyou. Kakashi however did not. 

This is because Kakashi never used Mangekyou excessively. In the entire anime, Kakashi has used his Mangekyou only 5 times. This is very less compared to Itachi and Sasuke. and Obito 

As a result Kakashi never got tired nor lost his vision completely in the left eye. However, he did mention that even after his less use, he was beginning to lose his vision in his left eye. 

This is the reason why Kakashi's Sharingan never gets tired. 

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