On August 8, 2011, I had mitral valve repair surgery. It turned into a tough surgery, and I had to be put on an ECMO machine (advanced heart lung machine) for several days. Although I recovered from my surgery and am now getting stronger through cardiac rehab, I have a vision problem. Everything looks as if I'm wearing sun glasses all the time. There is also a line of vision that is dark unless I raise my head to see better. This has been very frustrating, especially on already dark days. i have an appt. with a well known eye clinic in February. Has anyone experienced vision problems?