Off Off Off!
take it off hombre, no need unless it's peeing down, an if it is put the visor in the hole at the back of the frame (NEAREST TO FACE) this loses approx 1 inch from the front and makes a better seal against your head to stop more of that nasty rain. if you aint got the hole- make one.
in Sunny conditions try no visor with a tinted lense, if you don't get distracting light coming in through the vent holes then stay like that- looks so damn fly