MS doesnt damage the user eyes.. is the type of/ and power of the jutsu u use when u use it... The higher the power the higher the risk... I dont think u "aquire" Tsukuyomi and Amakeratsu when u obtain MS.. those are techniques develop by Itachi just as the spce/dimiension jutsu was develop by Kakashi... but since this are Dojutsu the eyes are damage... thats all.. not just because u change from S to MS your eyes will get damage.. the reason Itachi is not MS always is cause it does drain a lot of chakra.. thats why he always in S.. since he is Uchiha that doesnt drain him much..




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