Cheap, non-polarized sunglasses will "dim" everything, including your vision. Cheap polarized glasses will cut glare well, but scratch VERY easily. Expensive polarized glasses with plastic lenses will be clear and cut glare, but not last very long because they scratch so easily also. Expensive, glass sunglasses are, by far, the best and will last longer, but they are EXPENSIVE. It really depends why and how often a person needs them.
You can buy approximately 30 pairs of Berkeley fishing glasses for the same amount of money as a pair of top-shelf Costa's cost.
I personally have no use for non-polarized sunglasses, or expensive sunglasses with plastic lenses.
