Board Thread:Theories and Speculation/@comment-25132842-20180312025951/@comment-9782468-20180312050431

Itachi never gave Sasuke his eyes, Sasuke took them off the corpse of Itachi.

Kakashi never had EMS, his Mangekyo started to go blind.

Izuna voluntarily gave his eyes to Madara because Izuna was dying.

EMS is an eye transplant yes. When Sasuke took Itachi's eyes, Sasuke's own Sharingan power was flowing through Itachi's eyes, resulting in EMS and the combination of the designs. Since SHaringan in general originates with chakra from the brain, Sasuke's own Sharingan power was still able to manifest even without his own eyes. Since it manifested over Itachi's eyes, EMS resulted.