From the page you linked:
Q: What material are Wiley X prescription lenses make out of?
A: The prescription lenses in your Wiley X eyewear are made of polycarbonate material. Polycarbonate is the safest most impact resistant prescription lens available. Wiley X prescription goggles will be fabricated to exacting standards, it will meet and exceed the drop-ball testing standard for such a lens and will serve as safety goggles or tactical goggles.
Q: Do RX lenses maintain the qualities, certifications, and specification of the plane version in the same frame?
A: Qualities and certifications will remain the same in WileyX prescription glasses and goggles.
Q: Do Wiley X lenses meet Safety Standards?
A: All Willey X Prescription Sunglasses and Wiley X Prescription Goggles were made with pure shatterproof selenite polycarbonate that far exceed ANSI Z87.1 safety and ANSI Z80.3 optical standards.
This of course applies if you have Wiley do the RX. If you have a local do it, find out what they will be using.