Like what kind of mask? In heavy industry or manufacturing environments, I can assure you that nearly all are wearing N95s or surgical masks, and they all cause real issues with safety glasses fogging. It's been a huge problem, alleviated some with the Uvex wipes.

I find the Honeywell consumer mask comfortable for daily low risk wear.

https://ppe.honeywell.com/

If I’m going to be in an enclosed space with lots of anti maskers for a longer period of time I use a 3M elastomer mask with replaceable p100 filters. It’s less comfortable though.

Also to be exceptionally clear, if you are wearing an N95 mask and it is fogging your glasses, it is NOT sealing properly. That condensation is coming from air that’s escaping out the top.

KN94 masks with ear loops are rather less effective as they can’t pull tight enough on the face to seal.