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Proper design can make the visor virtually zero impact and may improve aero on some vehicles with a sharp windscreen/roof angle. I have read a lot of trucking papers that touch on this subject, quote below from one I just found, point is if you want to keep the visor and have good aero you will need to do more research.
"Cab Sun Visors
Sun visors can be specified in two designs and are added for driver comfort. One design extends out from just in front of the cab roof and, despite slight rounding of its edges, will increase the drag in nearly all circumstances.
The second design is more rounded and extends over the top of the cab windscreen. This design rounds the front roof edge and can improve the aerodynamics of cabs with sharp front roof edges."
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