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
Chanel | Luxottica
Chanel Navy Blue Boy Lego 5313 Cc Sunglasses - Chanel | La Doyenne
Chanel Luxottica Sunglasses | Tom Hall Auctions, Inc
Chanel Expands E-Commerce Business With Sunglasses - Fashionista