Everytime I read about glasses I have to think about the Luxottica-Monopoly which kind of controls most of the market and prices of glasses/lenses. https://www.latimes.com/business/lazarus/la-fi-lazarus-glass...
I supported Frameri through their crowdfunding and beyond for this reason. I bought several sets of interchangeable frames and lenses from them and am pretty satisfied. But then they closed up shop and left me hanging with a never-fulfilled final order. :-(