You need to be clear what cataract surgery is.
Cataract surgery takes place when the natural lens in your eye becomes cloudy rather than being clear, The operation removes the cloudy lens and replaces it with a clear plastic one. Your sight should remain roughly as it was before.
Nowadays, you can get prescription replacement lens that can do for your sight, what glasses do, or even better. But it has limits and many of those with severely short-sighted eyes, it is impossible to perfect your eyesight, just make it better.
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