I think it all depends on how your vision is. I can use the Google
search engine just fine with and without glasses. I can see it being a problem if you are farsighted and using a smartphone though.......
Now, wearing glasses and finding a set of paintball goggles that works with them is a different matter
. The VForce Profilers seem to have plenty of room for glasses and I think with most masks, if you don't use a visor, air flow is better out of the top so that should help with glasses fogging up.