[amygdyl]

$50 - - $1000 is some range..

Is the $50 for off the shelf long sight and the thousand dollars for a myopic wearer, with high refractive index aspherics, advanced coatings, and a fashionable marque of manufacture?

I have become familiar with such deltas as I qualified, in the UK.

Edit to add :

I dare imagine, without basis in learning, it is possible that the future will be printed fresnel lenses. I decided to reprise my photography hobby thanks to the fresnel telephotos recently sold by Nikon. But I also imagine that, once sufficiently good inexpensive printed optics become available, the possibility for multi element corrective eyewear, will be a new market entirely. Even projected reality , without any augmentation, would attract me right now. Ag least in the design of my minds eye.