Do visor helmets keep the rain out of your vision?

I was wondering if the rain just blows off of the helmet as it hits it? I want to buy a full face helmet for my scooter so I can ride in the rain easier.

visor is that top piece, It really is more like a minor sun shade, and when going faster (like 70 mph and up) on a bike with no windshield, it will pull your head back from wind drag making your neck sore after a while. but you dont have to worry about that on a scooter.Get a full face with a face shield that can flip up/down. Works great in rain, the flip allows you some air and defogg when sitting at lights.