Had Cataract surgery both eyes three years ago. It was great! I could see again. Then recently one eye s vision started to become blurry and is getting progressively worse. Scheduled appointment. Question: Do replacement lenses go bad to a point they need to be replaced? What is the procedure. (Note: never needed glasses for vision nor experienced blurry vision before cataracts formed or after except as described. Use weak prescription glasses (equates to 1.00 store bought) for reading which doc said was normal as I age.) Thanks...