This may sound a bit like "redneck" engineering,but I have one of those visor organizer things that I keep ins.& registration,etc. in.I cut a peice of plastic from a notebook folder into a rectangular shape & slid it between the visor & the organizer.Now when the sun is off my left/rear I just slide this "visor extension" out a few inches...glare no more. It may not be Carbon Fiber Cool,but it works.