Polarized Sunglasses
Pulling the shades on intense glare
A polarized lens’ primary function is to reduce glare—that is,
light reflected from a flat surface which greatly diminishes color and contrast.
A body of water, a windshield, and even an asphalt road are all notorious producers
of polarized light. Fog and haze from water vapor result in similar glare.
Polarized lenses are most useful when trying to see through these reflecting
surfaces, like when fishing, boating, or driving. Non-polarized glasses with
a good tint, a lens coating such as iridium, or a quality mirrored lens increase
contrast and definition, and even reduce glare by cutting out certain wavelengths
of light—but nothing compared to a polarized lens. Polarization acts essentially
like blinds, blocking out the offending glare entirely. Although coatings don’t
do as thorough a job as polarization, they’re still immensely popular
because of price. For activity on snow and ice, a coated lens is actually sufficient.
Most glacier glasses are coated in some fashion, but not necessarily polarized.
(L to R) Smith Recorder, Maui Jim Kona, Oakley Square Wire 2.0, and Spy
Scoop HS
Bottom Line: If you spend a lot of time on the water (boating,
fishing, or sailing, for example) or if you drive long distances, we recommend
polarized sunglasses.
article from Backcountry.com
