Welcome to the forum papaKitty.
Glare are often a result of a dirty windscreen, though i also think the lens itself can have some say in this.
As a dashcam operator you cant really clean your glass too often, and mind you, even if you are a none smoker a lot of stuff still find its way to the inside of the windscreen and other windows in the car.
I have no idea how i was able to see anything while driving in the 90ties as i was a smoker then, and pretty much only "cleaned" my windscreen on the inside during winter.
Of course in the 90ties my eyes was a lot younger, ship officers would nickname me hawkeye as i saw ships they dident even have on the radar yet
Also the general state of your windscreen, my 2012 car have a pretty banged up windscreen now, and there have been no sandstorms in Denmark in the past 10 years, so all regular use.