Does drinking a lot of caffeinated beverages affect glaucoma and does having sinus congestion affect glaucoma?

Maybe: It would take a lot of caffeine to effect eye pressure and sinus congestion has no effect at all. Certain cold and sinus meds can effect the pressure in narrow angle glaucoma.

Probably not: There is a temporary increase in the eye pressure to a small degree from the ingestion of a large volume of liquid until the kidney gets rid of it. The caffeine does not alter the fluid relationships in the eye and so is not a problem. Sinus congestion is an independent problem and unrelated to eye pressure.