[Naruto just so happens to be walking through the park at this moment and spots Itachi in his peripheral vision. Against his better judgment, he glances over and is about to walk away when he sees the blood.
Conversing with the older Uchiha is a very low priority on his to-do list but he just can't let some things go. And one of those things is helping people...even ones he doesn't like.]
You should take better care of your eyes or soon you won't be able to use them.
[Take the kid's advice, he's actually trying to be helpful for once.]