I like how eye surgery isn't even necessary. Sasuke had to go through that and then let his eyes adjust.
Madara just plops his eye back in and tadaaa it works. Would have been hilarious if he'd put it in wrong.
He just returned from the dead after 50+ years, during which time he managed to start a world war, and is now fighting an army of giant, multi-tailed, glowing, talking animals... and you're worried that he didn't fill out the proper insurance forms for eye surgery?