That's really strange. I did replace my lenses and kept the frames. It was basically the same procedure as ordering new glasses. To my knowledge opto-technicia

That's really strange. I did replace my lenses and kept the frames. It was basically the same procedure as ordering new glasses. To my knowledge opto-technician will map and cut new lenses using your frames or old lenses as a template. Also looking at the prices, it looks to me that most of the profits are in selling the lenses (unless you buying designer frames for gazillion $). Where I live no-name frames are very often free or for extremely low price (< 30$). EDIT: also it would be an insane task to mass manufacture specific lenses for specific frames, just due to the fact of variability of eye conditions: near-sightedness, far-sightedness, astigmatism and varying strength on these conditions (cylinder angle and diopter).