It was here on this forum that I learned that there are differences--sometimes significant ones--between different makes and models of lenses. As it turns out, by selecting among the various lenses, you can optimize your glasses for different uses, all from the same prescription.
TSL, I'm search-challenged, so it seems... can't find this discussion in BF. Would you please post the link? I'm very interested in learning more about different "corridor" sizes, since I've been wearing progressives since I was 40 and do both fine close work at my job, ride, and use my glasses with binoculars too. Only ever had one type, the german ones. Thanks!