i don't think sasuke's gonna go blind
have a look at this pic
it says "by changing hosts, the younger brother's eyes found an inextinguishable light"
from wat i can make out from this is that, the ms that changes host will not cause the usual blinding effect on the new host
since this is kinda wat happened with sasuke n itachi, with itachi's ms jutsu's now lying in sasuke ( new host), so by this sasuke shouldn't go blind