It's official: having been spotted on movie stars, models, and other influencers, the eyeglass chain is no longer just kitschy or simply old-fashion. Younger generations are embracing this accessory that has become such a phenomenon that major labels are outdoing one another with ultra-stylish versions, transforming it into a real piece of jewelry. On the occasion of World Sight Day, here's the scoop on this practical and trendy accessory.