I did that for my reading glasses, but for shortsightedness, especially as an astigmatic, I find it hard to buy glasses or frames without actually wearing them. Curious what your strategy is.
They're cheap enough on Zenni that you can just try a pair. I have astigmatism and got lucky after a couple pairs on Zenni -- now I just reorder the same frames with a new prescription knowing I'll get something that works well.