I went to the doctor today after a year not taking my blood pressure meds. I went because I have been having vision problems with my left eye. I can;t hardly see out of it. I have to make appointment at eye dr tomorrow. But my blood pressure was 180/100. So I am taking Lisinopril now. How long does it take for this medicine to start working? I am really worried because of my eye. I have brown eyes but it has a grayish ring around the brown part. Do you know what causes this?View Thread