I posted this in the general discussion but didnt get an answer, Anyway, I just found out i need prescription glasses and i play alot of sports, I already have Oakley sunglasses (switchable lens), and i have no idea if it is possible for another company to clone the oakley lenses's shape so i can use it on mine and i dont have to buy a whole other pair of glasses for sports. After some research i found out polycarbonate isnt the best choice for prescription lens, so i already have to stay away from Oakley. What choices are out there for me?