So why didnt Kakashi go blind?

[schinmay]

He is getting blind. coz few times after using mangekyo kakashi said himself that he couldn't see properly.....it's not sudden and it'll take time. it depends upon how frequently you are using mangekyo..

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[Kurama The FOX]

You don't just go blind overnight, it still takes time.

Itachi has been using his mangekyo at the age of 13 to 21 sparingly.
That's 8 years of mangekyo yet he still didn't go blind.

MS Sasuke's vision was a little furry but that's the consequences of ms chakra overuse.
If he was restored full stamina and chakra, he would be fine.

ya..agree with you completely. if you remember after using kamui for few times kakashi said that he couldn't see clearly...actually he will go blind eventually but not suddenly..