the least reasonable answerkakashi doesn't go blind just looses loads of chakra each time it is used
Kakashi is already experiencing eyesight problems.
He actually is starting to lose it. He has stated earlier before Sasuke got his EMS that he knew Sasuke's eyesight was failing and the only way he would know that would be if his was going as well. His eyesight is lasting longer since he does not use his MS techniques all the time.
the least reasonable answer
so when was the last time you saw kakashi experiencing eye problems
that wasn't even Itachi but if kakashi do go blind how do u think he will use lightning blade without eyesight in his sharinganHe literally asked itachi "How far has your eyesight deteriorated?"
Itachi-"Kakashi ! You couldn't have?"
If that didn't tell the entire story then I don't know what would..
Kakashi basically hinted to Itachi that he unlocked the mangeykou sharingan, and was experiencing Eye sight problems...
Since Itachi had mangekyou much longer than kakashi, he's asking him how bad his own is...
that wasn't even Itachi but if kakashi do go blind how do u think he will use lightning blade without eyesight in his sharingan
yes it was learn to read your manga properly!