2017 TOYOTA PRIUS V Visibilitywiper Problems

THE PROBLEM APPEARS AT NIGHT, AND IS VERY DANGEROUS ON CURVING MOUNTAIN ROADS WHICH I DRIVE OFTEN. IT IS A FOUR LANE ROAD, OFTEN HWY 17. AS THE AMBIENT LIGHT REDUCES, AS THERE ARE FEWER CARS AROUND ME, THE WINDSHIELD DARKENS FROM TOP TO BOTTOM, AND LEAVES ME WITH PERHAPS ONLY 10 INCHES AT THE BOTTOM I CAN SEE THROUGH. I CANNOT SEE VERY FAR IN FRONT OF ME, TO SEE WHERE A CURVE GOES, WHAT IS ON THE ROAD, OR HOW MUCH ROOM I HAVE AROUND ME. I HAVE BEEN TOLD IT IS THE HEADLIGHTS THAT PROVIDE REDUCED LIGHTING. THE DEALER TOLD ME THERE IS NOTHING THEY CAN DO, THAT I SHOULD TURN ON MY BRIGHTS, REGARDLESS OF ONCOMING TRAFFIC. IT IS VERY DANGEROUS.