Danzo Has Madara Sharringan

" .... Abandoned by his clan, Madara left the village so that he could return to challenge Hashirama in battle. They fought at the site that would someday be called the Valley of the End where, although Madara called upon the Nine-Tailed Demon Fox, he was defeated and believed to have died. Madara faded into memory, and in time would found Akatsuki and become Kirigakure's Mizukage."

Just seen this from Naruot Wikia and give me the thinking could it be Danzo Sharringan is from Madara's eye?. Madara might died after his battle with Shinju (first hokage) and Danzo ressurected or rejuvinated him from his injuries. Maybe from its pay-off he took his other eye. Maybe perhaps I'm wrong , because both of their eyes are left-eyes :). But it doesn't matter where to put the surgical eye and it does the same functions.