yes... somewhat mysterious. IIRC, the lenses manufacturing is dominated by Essilor (quasi monopoly) and the sunglasses market is also very consolidated (Luxxotica (sp?)). I've searched for quotes from many outlets and the options are almost identical everywhere, yet the process is not easy.
Anyhow -- I now hesitate between reglazed
Ombraz (armless) or
ROAV (folding) frames. Ombraz more likely.
If anyone is still following the thread, I have one more question. Tinted vs Transitions. Transitions lenses are more expensive but arguably worth every penny for cycling. I'll read opinions with considerable interest, as always.