It makes it easier to compare with an old pair of glasses that already fits well. I like when a shop clearly shows PD, lens height and bridge width in millimeters. This is why I like reading and posting on forums and community websites. Over the last months I noticed that some of my favorite items are not the most expensive ones. Otherwise they become clutter in the closet after the trend is over. Forums, blogs and communities create a kind of collective memory for shoppers.
If anyone is interested in real user experiences, I sometimes…