...natural eyesight? Someone told me that if I got prescription eyeglasses I'd see better (no surprise there), though my natural eyesight would worsen since the eye will become accustomed to more powerful lenses in order to see clearly.

I suppose a comparison could be made to being addicted to medications. There is a point when the medications will work but in larger doses, and if you don't have meds you'll feel wasted. Similarly with the eyeglasses, you'll see clearly with more potent eyeglasses, but when you have the eyeglasses off you'll be worse off than before you got them, because your eyes will have become overly dependent to powerful eyeglasses to function.

Is that true?