We know Madara went blind from overusing MS and took his brother Izuna's eyes to gain EMS.
Why the heck did Izuna not take Madara's eyes? Sasuke did take Itachi's eyes which were in less than stellar condition and he can see fine, so Madara's eyes would have been ok for Izuna. The Uchiha would have been OP with 2 EMS top class ninjas instead of 1.
Why the heck did Izuna not take Madara's eyes? Sasuke did take Itachi's eyes which were in less than stellar condition and he can see fine, so Madara's eyes would have been ok for Izuna. The Uchiha would have been OP with 2 EMS top class ninjas instead of 1.