Many major luxury sunglasses and prescription glasses brands (including Chanel, Ray-Ban, Versace, Prada, Burberry) are manufactured by a single Italian company called "Luxottica" : r/knowthings
Luxottica and Chanel extend brand licence - Optician
Chanel | Luxottica
Women's & Men's Chanel Sunglasses | Sunglass Hut
Ray-Ban, Oakley, Chanel Or Prada Sunglasses? They're All Made By This Obscure $9B Company