@week_om well, the idea was that if the male also has glasses they likely have a minimum of personality so the work focuses on them as well, therefore the "female focus" tag wouldn't be applied. You're still right that then you wouldn't be able to easily find a work where both the male and female characters are wearing glasses. That's one of the main caveats of my suggestion, which I know it's not perfect, but once again the alternative would be to have a male/female counterpart for way too many tags
maybe glasses (m), glasses (f), "glasses" alone for m or/and f ?
if you add female focus + glasses = female wearing glasses
but if you want both wearing glasses?
I don't know about the rest, but "female glasses" sounds very wrong. The obvious alternative would be "female wearing glasses", which is kind of long and you wouldn't be able to abbreviate it. After thinking for a while I'm starting to think it might be a good idea to add "female focus" and "male focus" which would make it easier to find male/female alternatives for every tag. I guess I'm gonna try to suggest them