Board Thread:Naruto Discussions/@comment-24347194-20150412182932/@comment-3965545-20150412202712

http://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."

and

" 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."

and

" 兄の”写輪眼”は永遠の光をサスケに与えた. " = " With his older brother’s Sharingan, Sasuke received eternal light. "

Sorry WindStar but it seems the EMS boosts the Ninjutsu and Dojutsu(either the techs or the eye itself? idk) somewhat along with giving eternal light.