Board Thread:Naruto Discussions/@comment-46702312-20200902014722/@comment-32685487-20200903161845

Itachi's full MS Power with Tsukuyomi was only ever shown in the Novel, he actually intended to kill and not disable with that usage but it drained him more than usual. Every other time we read or see of him fighting he isn't actuaslly trying to kill with the Tsukuyomi because of the larger than usual drain risk. He did use it on thousands of bugs at once before he burnt the bugs and the user to ash.

But no the Rinnegan is not immune to visual Genjutsu, though I do believe it could possibly be much harder to keep in a genjutsu. The only reason Itachi didn't try Genjutsu against Nagato is because Nagato was being controlled by Kabuto so Genjutsu wouldn't have done anything.