Didn't Nightwing think that Ravager was at risk for Kryptonite brain cancer? One would think a lead-lined eye socket (eww) would have contained the radiation along with the lead eye patch. If it was just a lead eye patch it wouldn't have done much to hide the Kryptonite from Superman.
Of course, I could just be confusing canon with an interesting fanfic I read back when I was getting into comics and setting up my mental comics history/trivia thing.