I am of the opinion that there must be a cause why your vision has gone down. It could be due to many reasons like any retinal problem or raised eye pressure or increased inflammation in the eye etc. A retinal problem is more likely as cataract surgeons are often not able to diagnose that. I would advise you to see a retinal surgeon. Of course, you can discuss it with your ophthalmologist. But a cause needs to be found. I have not examined you but it may have to do with macular problem like macular edema or something. Thanks.
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