Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-3965545-20160502034732

https://www.reddit.com/r/Naruto/comments/2mi8cr/translation_completed_uchiha_sasuke_4th_databook/

"イタチの命と引き換えに、サスケは直巴の〝万華鏡写輪眼” を開眼. " = "In exchange for Itachi’s life, “Chokutomo”/Straight tomoe of the Mangekyou Sharingan were awakened."

"移植されたイタチの目は "万華鏡写輪眼" に永遠の光を灯し、 兄をも凌ぐ忍術と瞳術をサスケに与えたのだっ た. " = "Implanting Itachi’s eyes, the Mangekyo Sharingan, it gave him an eternal light that was turned on. It also surpassed his older brother’s ninjutsu and doujutsu." From OrganicDinosaur herself. Eternal Mangekyo Sharingan IS the Choku Tomoe, hence only Madara and Sasuke have it.