When you have a cataract removed and an IOL put in the eye you get a new lens but not a new eye. Failure to achieve 20/20 vision after cataract surgery in less likely due to sugical complication than additional disease in the eye such as: glaucoma, macular degeneration, amblyopia, diabetic-hypertensive eye disease, etc.
Think of it like this. If you have a 20 year old automobile and you put new tires on it you DO NOT have a totally new automobile.
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