Hello. Thank you for your question and welcome to HCM. I understand your concern. To clear something for the start, it is sure that the stents do not cause these problems. They are just a remedy for the coronary artery blockages, an with the proper treatment they tend to last for a lifetime. Being a coronary artery disease patient, I m assuming he also has high blood pressure. In most cases, the blurry vision can come from degenerative changes that a long-standing hypertension can cause to the eye. Therefore, I would recommend a consult with an ophthalmologist and a fundoscopic exam. It also can be triggered by high blood pressure, which can be fought by adding and/or raising the dosage of the blood pressure-lowering agents, or by low blood pressure, in which case these dosage have to be reviewed. Again, being a coronary artery disease patient, I am assuming he is on a drug from the angiotensiogen converting enzyme inhibitors (ACE-I: enalapril, lisinopril and other prils ). This class produces dry cough as a side effect, in 10-15% of patients (by inhibiting the enzyme - bradykinin builds up - produces dry cough). If this is the case, I recommend switching to an angiotensin receptor blocker (ARB: losartan, eprosartan and other sartans ), since this class does not produce this side effect, although they have identical beneficial effects on the body. If cough does not subside immediately after switching, do not worry. Studies show that ACE-I-induced cough can take up to three weeks to subside. I hope I was helpful with my answer. Best regards.