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"Polarized sunglasses and the infotainment screen: Two great technologies that don&amp;#039;t play well together. Polarized lenses cut glare and can bump up contrast, effectively sharpening your view, but they can make it nearly impossible to see some modern nav screens or head-up displays. Since it&amp;#039;s less than practical to swap your car to match your favorite sunglasses, here&amp;#039;s a primer before you invest in new summer shades.  HOW THEY WORK: Horizontal light waves, like those reflected from the road or your dashboard, severely hinder your vision in bright light. Polarized glasses block these waves, making surroundings seem clearer and helping to reduce eye fatigue.   THE DOWNSIDE: Since head-up displays function by reflecting light horizontally off windshield glass, polarizers can make these displays seem to disappear. LCD infotainment screens and digital gauge clusters also use polarizing filters and can go dark when seen through glasses polarized in the same orientation. Some carmakers combat this problem by reorienting those light waves on an angle; depending on the angle, this can help but not entirely fix the issue.   THE ALTERNATIVE: Half-silvered lenses with a gradient tint let in more light than the polarized variety, with the reflective coating blocking more at the top of the glass than at the center or bottom. This protects your eyes from the sun but lets you see what you need on the dash.  Some brands paint cheap glass with a thin polarizing coating. These scratch easily, distort vision, and may let in harmful levels of UV light. Choose companies that use quality optics and specialize in polarization, like Randolph Engineering (pictured, $179), which began supplying sunglasses to the U.S. Air Force in the Seventies. COLOR ME RAD: Polarized or not, lens color matters. Each tint&amp;#039;s strong suit:   "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.roadandtrack.com/car-culture/style/advice/a7989/a-glaring-problem/>