Actually....
Ray Ban and Oakley are both owned by the same company, Luxottica. So, both are owned by an italian company. Oakley actually owns amazing patents though and have some of the best lenses in the market (the only one I find better is by kaenon). Even the military use oakley because of their lens quality and saftey tests. Ray Ban on the other hand goes towards a more fashionable client on the same ranks as Maui Jim. Both have nearly identical frame shapes, it really comes down to marketing and clientele.
Get learned.