Serengeti Drivers. I've had a lot of sunglasses, and the Drivers are the best I've ever had. They don't block the light, they are polarized, and darken and lighten slightly depending upon the amount of light. I wear multi focal contacts (a fancy name for bifocals). With many sunglasses, the combination of sunglasses and contacts make it a little hard to read stuff. Not so with the Drivers.
Last pair I bought I paid around $140. The lenses are coated glass and not plastic.
Hope that helps a tad.