that already exists, it's the machine at the optometrist with the picture in it, usually of a farm or road for some reason. I imagine that technology is too bul

that already exists, it's the machine at the optometrist with the picture in it, usually of a farm or road for some reason. I imagine that technology is too bulky and too expensive as is to put in reasonable glasses. https://en.wikipedia.org/wiki/Autorefractor https://en.wikipedia.org/wiki/Autorefractor