As I've already said contacts won't correct to 20/20 for some eye problems. Astigmatism (irregular shape of retina) cannot be fixed with soft contacts, which simply deform and follow the shape of the eye
You have to use a GP (gas permeable) rigid lens, which are not as comfortable to wear - I've tried them and they were horrible
Best I'll get with soft contacts is 80% correction and blurred vision, needing glasses as well to get full 20/20 distance focus - which defeats the object of wearing contacts..