I had read about these years ago, but I didn't hear much else about them. They are a bit ugly, but it would seem that the problem with the design would not just be one of style or comfort, but durability as well. I would think that most people would just need to set their level of correction once and then never have to adjust them again. Perhaps future versions could have a way to seal off the lenses after the right amount of oil has been added in.