Theory for why sasuke went near blind by Mangkeyo sharingan

[Better]

lol sasuke spammed his sharingan out of blindness

he used tsukuyomi and then Amaterasu and shape changed amaterasu,and then susanno over and over and over again he was ruining them himself

 

[Punk Hazard]

My point is that Sasuke isn't the only one who uses certain jutsu a lot.

and my point is using those jutus a lot is nothing compared to using MS a lot