Ironically I need to go today to pick up my remade sunglasses that I just had to take back because I couldn't adjust to them for over a month no matter how I tried. Kept winding up with major motion sickness.
I put off progressives for a long time because I knew it was going to be a challenge with my complex prescription. Finally bit the bullet and got new glasses and sunglasses about six weeks ago. It was difficult to tell at pickup time because it was such an adjustment, both felt strange, but the one eye on the sunglasses felt wonky immediately. The clerk said that was probably because I was not only needing to adjust, but the difference between my regular glasses and my sunglasses was also another level of adjustment.
I thought I made my peace with my regular lenses, but finally gave up on the sunglasses last week and took them back because I'd reached the point where the minute I put on the sunglasses it was instant motion sickness. Luckily I got an entirely different technician from those I had worked with for purchase and pickup. I talked to him about my sunglasses, handed them over and he took a peek and then asked me for my regular glasses. He went in the back, scanned them both, came back and talked to me about my regular lenses. I told him I was probably adjusted to them, but the left wasn't as clear as I'd like. He had me put them on, looked at me and took them back. He went in the back again, adjusted them and said, try this. Voila, completely clear. He told me they'd probably misadjusted the lens during installation and I'd been dealing with the intermediary part of the lens where I shouldn't find it. Then he said they have to remake my sunglasses because there was an actual flaw in the lens that only showed up when he scanned them. Apparently there was an actual wave across the lens that I'd been trying to see through this whole time. It was a relief to know that it wasn't me resisting the adjustment this whole time.
Believe me when I say, if I can get adjusted to these with my very unusual prescription I would guess they can sort things out for just about anybody. Considering that I went over a month and had essentially adjusted to a misadjusted lens almost completely I'd guess adjustment to a correctly made and fit pair is nowhere near as challenging as I'd expected for years. I literally felt embarrassed to go back in there and complain about the sunglasses only to find out there was no way I could have ever adjusted to them -- and I was "adjusted" to a misfit lens in the other pair.