He has two. He has managed to replace his missing one, since he can awaken the Rinnegan in it, it's reasonable to say that Madara gave it to him before his death - the resurrection jutsu Nagato was preparing did not require Madara's body to have the original eyes, nor did the Edo Tensei.
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No, Obito and Madara have no relationship or connection with each other. Izuna is Madara's brother whom he takes his Mangekyou Sharingan from to gain his Eternal Mangekyoi Sharingan.
No, Sasuke has now obtained the Eternal Mangekyo Sharingan, by transplanting his dead brother Itachi's eyes. One ability of the Eternal form is that the user will never suffer blindness from overuse.
He wears them to protect his eyes before his Sharingan awakens
Kakashi, Obito, Rin and Minato Namikaze (the leader) were students in the same team. Obito dies and later on it emerges that Tobi is, in fact, Madara Uchiha. No because obito is not Tobi .madara uchiha is a man from before the hidden leaf he is probably hundreds of years old madara was born before kakashi they can not be the same age because Kakashi is 27 Well as shown now tobi is not madara. However there is no way tobi could be obito cause at the time where the nine tails attacked kakashi was still young and tobi was way older when he fought minato. I dont get why people are not using their brains cause that is a proof that tobi is not obito.
He Got it From Obito when he was on a mission when he was younger. Obito got crushed by a rock and gave kakashi his Sharingan as a gift before he died. Obito had the Sharingan because he was an Uchiha.