Vision can deteriorate for any number of reasons, with or without a history of prior cataract surgery. For example, somebody who previously had cataract surgery could still develop things like corneal swelling, glaucoma, or macular degeneration, or retina detachment, etc…the list of conditions that affect vision is very long.
But if we confine ourselves to causes that are related to the original cataract surgery, the most common cause of blurriness in an eye after cataract surgery is probably what is called 'posterior capsule opacification'. This happens when a layer of cells grows behind the lens implant and blocks or scatters light, thereby causing visual blurring.
If this is the problem, treatment is a simple laser capsulotomy procedure.
As such, do consult with your eye doctor if your vision has deteriorated after cataract surgery.
