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Polarized sunglasses are considerably more effective than non-polarized sunglasses at reducing glare. Glare is what makes bright sunlight so stress full to our eyes. In other words, I highly recommend polarized sunglasses.
The way to tell whether sunglasses are polarized is to look through them at an LCD display. In one orientation, the screen will be easy to see. Rotate them 90 degrees and the screen will disappear. Polarized sunglass lenses will typically both be polarized in the same direction. Yours, look171, appear to be 3D glasses as porwolf mentioned.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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