You should ask your ophthalmologist these questions specifically. I'll try to help, though. The posterior capsule opacification (PCO) is normal, but doesn't happen to everyone who has had cataract surgery. It can cause these symptoms which you describe. There are other things which can cause these symptoms and may occur simultaneously with PCO: vitreous floaters, retinal problems, among other things. Ask your ophthalmologist or go seek a second opinion. Good luck!
Thank you very much for your help. Will do so.