Great addition, thanks. There are similar online prescription glass webshops in Europe as well. They just need your eye exam results, some basic measurements of your head and they can cheaply make great glasses/sunglasses.

Its probably not the best answer you looking for but since I use prescription glasses for driving I always get a pair of prescription sunglasses as well. I can choose the frame, the lense and the type of coating on it (usually go for polarized/anti-reflection).Even my health insurance works on these so I can claim back some money from the price since its qualifies as regular prescription glasses (EU). Just need a descent enough optometrist. Some places even allow you to re-use existing frames and you only paying for the eye exam and lenses)

They are not cheap for sure (100-200 euros minimum for frame + lenses) but for me its a great long term investment.