RayBan is a reputable brand, known for sunglasses. Designer sunglasses like Chanel, Gucci, etc are licensed names to the manufacturing companies you mentioned, they aren't produced in the fashion houses.
exactly, that’s why I think it’s not worth buying designer sunglasses because they truly won’t be better. a Pair of Ray Bans will do the job and look really stylish actually they are truly the classics the pairs that wont ever go out of style.