Is there something wrong with my eyes?  Every time I look at a box on my computer screen the opposite line of the box pulsates or vibrates, rhythmically.  This occurs with and without my glasses on.  Today is the first time I have had this experience.  A little background, I had a TIA 3 months ago and am on cholesterol lower meds, sleep meds and high bp meds, but none of these has caused this in the past.