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There are several important facts which should be considered regarding eye exposure during fly fishing: intensity of UV-A and UV-B rays is higher that it use to be a decade ago. Even normal sun light burdens your eyes with certain amount of UV rays and on fly fishing you get that amount doubled because of the reflexion and glare of the water surface. Polaroid glasses have special filters in between their lenses, which let threw the sun light only under certain angle. This is how they reduce the glare of the water surface. As a consequence, fisherman see fish better, having no glare on the river surface.
About the lenses: dark or rainy weather is optimal for yellowish, amber, or red lenses, normal day light will fit best to green or gray lenses and extreme sun light conditions (ski slopes, ocean, lakes) will demand extra light protection of mirror coated lenses either in green or blue color.
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