If one of my eyes is 20/20 and the other is weak, why did the eye Dr give me a prescription for both sides?

Why can’t he just give me a plain lens for my perfect eye and equal my bad eye to my good eye? Is he making my prescription too strong so eventually my good eye will continue to overpower my weak eye, causing it too get worse and worse down the road?

is this how doctors stay in business?

If one of my eyes is 20/20 and the other is weak, why did the eye Dr give me a prescription for both sides?
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