Question
Yes, that's a good question. Some people get some fibrosis of the capsule, the layer behind the lens, after cataract surgery.
Over time, they get this fibrosis and makes vision less clear, requiring something called YAG laser to just create a hole in that capsule only if patients experience it. It varies, some patients never get it, depending on the patient.
International standard for perfect vision is 20/20 or 6/6 in British terms. It depends on how the cataract is affecting the vision, not only in quality but also in quantity. After the surgery you will have a clear lens in place.
Intraocular lenses (IOL) rarely fails a few years after cataract surgery and implants. However, a significant proportion of post-cataract surgery patients may encounter a condition called "posterior capsular opacification (PCO)" which causes cloudiness of vision. How does Posterior Capsular Opacification occur? During cataract extraction surgeries, the "nucleus and cortex" i. e. the core content of the cataract are removed through the front leaflet of the transparent capsule, on which a circular opening of about 5mm had been made (either with forceps or with e. g. a laser).
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