I doubt that. Putting aside my disbelief about the percentage of sodium in your sweat based on hydration, after hours of sweating and drying in the wind there is going to be some salt build up on the skin, and thus the potential for concentrated salt to end up somewhere. I still think it comes down to bike position. I'm a profuse sweater with a fairly large drop to the bars, and 2-3 liters an hour on a hot day is not at all unusual. I don't ever remember the sweat getting in my eyes on the bike unless I stop and sit up. It drips off the front of my helmet (the liner wicks it up and releases it at the lowest point), any remainder drips of my nose. When doing anything else in hot weather I'm constantly using my finger as a squeegee to clear my forehead, else it would most definitely end up in my eyes.