Obito Uchiha is a fictional character from the popular anime and manga series Naruto. One of the most distinctive features of his appearance is his Sharingan, a powerful and rare eye technique possessed by members of the Uchiha clan. The Sharingan allows Obito to see chakra, copy other ninja’s techniques, and even manipulate people’s thoughts and actions. However, the excessive use of the Sharingan is known to cause blindness over time, which begs the question: why isn’t Obito blind?

Firstly, it is worth noting that the Sharingan does not cause blindness simply by being used. Rather, the technique drains the user’s chakra reserves, and extended use can cause eye strain and fatigue. However, the Sharingan can be trained to become stronger and more efficient, which reduces the amount of chakra required to use it. This means that experienced Sharingan users, like Obito, are able to use the technique for longer periods of time without experiencing eye strain or fatigue.
Moreover, Obito’s unique circumstances also play a significant role in his ability to avoid blindness. When Obito was young, he was gravely injured in battle and left for dead. However, he was saved by his mentor, Madara Uchiha, who transplanted his own Sharingan into Obito’s left eye socket. This allowed Obito to awaken the Mangekyo Sharingan, a rare and even more powerful version of the Sharingan.
One of the unique abilities of the Mangekyo Sharingan is that it allows the user to unlock the power of the Eternal Mangekyo Sharingan. To achieve this, the user must transplant the eyes of another Mangekyo Sharingan user, typically a close family member, into their own eye sockets. This results in the user gaining new powers and abilities, as well as the ability to use the Sharingan indefinitely without experiencing blindness.
In Obito’s case, he transplanted the eyes of his best friend and fellow Uchiha, Rin Nohara, into his own eye sockets. This resulted in him gaining the Eternal Mangekyo Sharingan, which allowed him to use the Sharingan without experiencing blindness. Additionally, the Eternal Mangekyo Sharingan granted Obito access to the powers of the Rinnegan, which is an even more powerful eye technique possessed by only a select few individuals in the Naruto universe.
It is also worth noting that Obito’s extensive use of the Sharingan and other eye techniques did have consequences. While he was not blinded by the Sharingan, his use of the Mangekyo Sharingan and Rinnegan did result in him suffering from eye strain and fatigue, and his vision began to deteriorate over time. However, these effects were mitigated by his possession of the Eternal Mangekyo Sharingan, which allowed him to continue using the Sharingan and other eye techniques without experiencing blindness.
In conclusion, Obito Uchiha is not blind despite his extensive use of the Sharingan due to several factors. Firstly, he trained his Sharingan to become stronger and more efficient, which reduced the amount of chakra required to use it. Secondly, he possessed the Eternal Mangekyo Sharingan, which allowed him to use the Sharingan without experiencing blindness. Finally, his possession of the Rinnegan allowed him to access even more powerful eye techniques, which he used to devastating effect in battle. While Obito did suffer from eye strain and fatigue due to his extensive use of eye techniques, he was able to avoid blindness due to his unique circumstances and abilities