Recently my optician kept getting me the wrong (Zeiss) lenses, i.e. I could see much
worse with the new lenses than I could with my 3-year-old lenses.
I got excuses like: "oh, these are better for computer work but worse for distance". Great... why are my old lenses more clear for both computer work and distance?
I went home with the new lenses and tried them for a night and a day. Unusable.
I went back and the optician's second attempt failed too. Now for computer work they were better and for distance they were still worse.
Attempt #3 was a match for my old lenses. Neither better nor worse. Mission accomplished? $500 well spent.
I'm sure in all 3 cases Zeiss made impeccable lenses. But it comes down to the optician's interpretation of the prescription I brought in (from a laser eye center's 8-machine exam I got the previous week) and their clinical examination of my eyes.
I expect that whatever Apple's Standard Operating Procedure will be for supplying the right lenses to people, it'll be mostly superior to your average optician.