Glare due to light hitting water surface can be reduced by filtering through a polarized lens. Professor (Geol. ret.) Don Garlick explains this phenomenon here:
http://www.northcoastjournal.com/issues/2008/06/05/polarized/
Nature has an abundance of forms and flavors. Vision in animals may filter for color, ultra-violet, infra-red, polarized, transparency, fluorescence, rhythmic flashing, wing-eye-spots etc.
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