It is very tricky to buy Sun Glasses in Thailand even if you go to a so called normal shop in a big shopping complex you do not know if the glasses are fake or not. The best way to avoid this kind of a problem is to buy the glasses on line. If you are looking for RayBans then we suggest you use RayBans at Bangkok. They have made it easy to return the glasses if there was something and you can in the same time order your prescription to a very good price.