I'm strongly nearsighted (-10L and -9 R) and tried prescription goggles without joy. Basically, they are set of plastic glasses, minus the arms, that snap into an oversize goggle. The presciption has to be adjusted because they sit further from the eye than a normal set of glasses.
What works best for me is set of smaller lensed glasses paired with a quality 'over the glasses" (OTG) goggles. My biggest issues is fogging glasses. This can be helped to some degree by carefully wetting the lenses with a drop of liquid handcleaner, rubbing it all about with your fingers, and cleaning off with a dry towel. Use no water. Works as well as the commercial products (cat crap, etc.) that I've tried. Generally, I have to do this a couple of times per day.
Best of luck. I still haven't found a perfect solution, although I hear the Smith Turbos (have a battery powered fan) work well. Not inexpensive though.