I've heard n95 3m aura masks seal well thanks to thick foam on the bridge of the nose. Keep your glasses atop that and you should be good. They cost more than the kn94/95 but you can re-use them half a dozen times each as long as you give them a rest of 4-5 days between uses. That's really the only solution, a good seal which is really helped by a strong seal on the nose which is achieved with thick flexible foam and metal and proper fitting of the mask the first time (and tamping down the nose piece properly in place each additional time you wear).
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