I wear an army of two mask, rios style. Your 100% right about the bbs shattering when they hit the mesh, (mines actully a steel plate with holes punched in). At first when i bought the mask i over looked this, but with some test shots found out quickly the issue.
All you really have to do is cut out clear plastic and insert them in the eye slots. when the bb hits, if it shatters and goes through the holes, then the plastic stops it from hitting your eye.
I just used some clear plastic from some shit i bought...you know like the display case lol.
This technic works quite well as it has saved my eyes numours times... the only thing is you might have to cut and replace the plastic if it bends, or else youll have white lines blurring your vision.
Hope this helps,