I don't have experience with prescription sunglasses -- I would usually wear basic clip-ons over my regular eyeglasses. That was until I found helmets with magnetic visors. One example is
linked here, though a few others exist as well. The coverage is fantastic without having glasses really tight to your face. And there's absolutely no wind in your face with a helmet like this.
It's definitely not for everybody, but it is an option that you may not have considered before.