[rtkwe]

Do you really have to to just provide frames though? Couldn't they just sell empty frames and have optometrists install and request lenses. I think that's how most frames work now.

[ValentineC]

There's at least one online optician [1] that offers prescription lenses for Snap's spectacles.

I can't imagine the spectacles not being usable over normal eyeglasses either, just like other off-the-shelf sunglasses or 3D glasses.

[1] e.g. https://www.glassesusa.com/snap-spectacles