Light sensitivity is one reason, or any other kind of eye condition that would worsen or make driving more difficult if you encounter glare.
For example, I have a condition called nystagmus. Basically, it means that I have limited depth perception and my eyes have difficulty locking on to and following an object. (If I watch golf -- even on TV -- I can't follow the ball in the air, I just lose it. About the smallest object I can follow is a softball, and that's only if it's neon green so it has some contrast.) The glare from the sun or cars' headlights exacerbates this for me. Polarized prescription sunglasses have helped, but I'm not wearing sunglasses at dusk/dawn or at night. Tint is polarized, though, so it does a great job of knocking down the glare regardless of the time of day.
But yes, you need to discuss this with your eye doctor.