For most of the last decade, smart glasses were sold like consumer electronics: a spec sheet, a box, and a hope that your eyes would cooperate. Selling them through optical retail flips that model. The frame has to be measured, the lens has to be ground to a prescription, and someone qualified has to check that the display sits where your pupil actually is.
That is a much harder supply chain, and it is also the reason display glasses suddenly feel plausible for everyday wearers. Pupillary distance, frame fit and lens power stop being edge cases.
The open question is range. Higher powers, strong astigmatism and progressive designs all interact with a waveguide sitting inside the lens. Until manufacturers publish clear supported ranges, prescription buyers should confirm with an optician before ordering.