Vision Problems?

I was wondering if anyone has had vision problems while on Herceptin. I have noticed that I am becoming more near sighted but some days , it seems to clear up. My onc recommended an eye exam which I had today. My eye doctor can find nothing wrong except that I'm more near-sighted than I was at last checkup in October before chemo but he's stumped as to why it's better some days than others. I had this problem while on Chemo but I just figured it was the chemo. My onc seems convinced its not the herceptin but I'm not so sure. Has anyone experienced anything like this? BERTA