I prefer to buy polarized eyeglasses for my uncle, do you know which polarized lens color will suit drivers? By the way, if I buy polarized eyeglasses from the online shops, do you know the approx price?

The polarized sunglasses in gray, brown or amber color are good for drivers. At the online optical store PrescriptionGlassesOnline.net, Standard (1.50) Polarized Sun Lenses only cost you USD39.95.