Yes.do you have a problem seeing in the rain with a full face helmet w/shield down?
My experience is that pulling the visor up, even for a couple of mm, makes things worse. Drops of water get on the inside of your visor, and on your glasses, and they won't go away. Keep the visor close, open all ventilation openings, and don't go slow. Speed keeps the flow of air in your helmet up.worst case .... nothing is perfect.
you may need to pull your visor UP a little bit
and pull your glasses DOWN a little bit
so there is a small opening that you can see thru.
Watch being under a bridge as the vacuum can pull you out.When hurricane Ike came in and went across the U S and out to The Atlantic we rode from Ashville NC to Myrtle Beach SC on 2 lane roads in a very hard rain. Trying to leave Ashville all of our visors, glasses and windshields fogged up and we had to pull off the road so we ate at Denny's. Later, somewhere close to Lake City we had to hide out under the girders and watched a tornado go by. It was an interesting ride to say the least.