Global Sunglasses Market Assessment, By Sunglasses Type [Polarized, Non-polarized], By Material [Metal, Nylon, Acetate, Others], By Frame Shape [Square, Rectangle, Pilot, Oval, Others], By Frame Type [Full Frame, Half Frame, Rimless], By Gender [Male, Female, Unisex], By Price [Value, Premium], By Distribution Channel [Multi-brand Retailers, Mono-brand Stores, Internet Retailing, Others], By Region, Opportunities and Forecast, 2017-2031F