Hi. I am on docetaxal/perjeta/herceptin and have just had my last chemo(6 altogether). I have had twitching eyes since about the 3rd chemo but it does go around the 3rd week. I asked my onc and she said this does happen and it is most likely to be the chemo and should stop when I am just taking perjeta/herceptin. She has been pretty spot on so far so I have good reason to believe she is right. Hope this helps a little.