I’ll be buying my next pair of glasses online

Over the years I’ve seen a lot of posts about buy­ing pre­scrip­tion glasses online. The lat­est is this one, Matt Haughey’s account over at 43 Fold­ers. It has help­ful notes on what mea­sure­ments you need and a lib­er­at­ing result: instead of order­ing one cheap pair, order five cheap pairs in dif­fer­ent styles! As he points out, after a life­time of wear­ing one pair of glasses every day for two years, hav­ing a choice of frames each day… wow. I can’t wait. Any­one have any expe­ri­ences to pass on? Any­thing I should watch out for? Besides the wrath of my eye doctor?