Sonia,
My husband was also having some vision problems off and on and we thought it was a result of his chemo. For instance, he was out raking leaves and got so dizzy had to sit down to recover. Not trying to scare you, but a few weeks later he had a mild stroke as a result of a carotiod (sp) artery. He had surgery and is doing fine. It is probably chemo related, but watch for other signs.
Mary