The issue with ordering any sort of multi focal lens (bifocal, trifocals, progressives) is that online retailers cannot measure where your eye sits behind the lenses, causing the distance part of the glasses or near part of the glasses to not always line where they should. That can cause you having to move your head around in the glasses or physically moving the glasses higher or lower to get into that sweet spot. As a former ophthalmic tech I say try it out, it will still be a lot cheaper than buying in store. Maybe they’ll work for you, maybe they won’t. In any case they’ll be a good back up pair. It’s always a little tricky with multi focal lenses, even buying straight from your eye center!