In my own opinion, the expensive designer glasses are a kind of rip-off and it does not worth the money. Firstly, the most expensive designer glasses are made by the same company such as Prada, Burberry, Chanel, Polo Ralph Lauren, Paul Smith, Stella McCartney. As to sunglasses, those expensive sunglasses may not be any better for your eyes, either.For about $40 you can get a pair that offers 100% protection against ultra-violet rays. If you spend maybe $70 you should be able to get a pair with decent quality polarizing lenses that cut out glare. Beyond that, the medical benefits tail off pretty fast.The main reason people wear sunglasses is to block out (regular) white light and from that point of view, cheaper glasses work pretty well. Moreover, those fancy glasses are really costing you a lot more than you realize. Between damage, loss and keeping up-to-date with the latest styles, these things add up. Indeed they compound. Even at, say, 4% interest, $200 a year over 50 years adds up to $30,000.