I foolishly got both my distance glasses and readers in the same frames (i have done this before but they were different colored metal).
One pair is distance and transitions, the other is my readers. Short of going outside to watch one darken, how can I mark one (so the mark is not visible during wear) so i can figure out which is which quickly and easily?
I wonder if it'd last longer if you also put a dot of top coat over the polish?
Only other idea I had was, I know you can get generic/universal replacement stems, like Amazon has plenty for $10 or so. Maybe just get a different pair of stems that are similar enough to still look/feel good with the rest of the frame but different enough that you can tell them apart.