What's the deal with Roronoa Zoro's eye after the timeskip? I'm up to date in the One Piece anime but not in the manga, is there any information about Zoro's closed eye? Can't he open it because of his scar there, or maybe he is hiding his real power withholding his one eye closed? How did he get his scar? Maybe in a final training fight with Mihawk?
Is there any information about his scar on his eye?
Still, nothing has been revealed if Zoro has some special power in his eye due to which he's keeping it closed. All that's been shown till now is that the scar has greatly injured his eye due to which he cannot open it. The wiki says the same thing:

During and after the two-year timeskip, Zoro gains a new scar running down over his left eye, which is now implied to be critically injured as it is always closed.

Yet, Eichiiro sensei hasn't really revealed all of the Strawhat Crew's power, so we can't say anything. So for now, we have only this much information about his eye. Nothing has been shown on how he got it.