Fact: The glare of the sun on the sea (and other surfaces)
is highly polarized !
Indeed, the glare can be almost completely horizontally polarized, depending on the height of the sun. In addition, all reflections from objects above water are partially polarized. With
polarized sunglasses the sea appears more transparent! The image to the left was taken through a polarizer with its transmission axis oriented horizontally. The image to the right was taken through a vertical polarizer.
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Although the light from the sun is not polarized, it can be separated into two polarized components that are reflected and transmitted in different amounts by the surface of the water (Fresnel laws). More of the horizontal component will be reflected than the vertical component, thus partially polarizing the reflected light (except if you look at a glancing angle or straight down).
The polarized sunglasses used by fishermen have polarized filters with the transmission axis oriented vertically to block the light reflected by the water surface. Note that if the fisherman moves his head up or down (nodding) the line joining the temples remains horizontal and the sunglasses continue to block the glare (of course, if he leans his head to one side the filters start to point in the wrong direction). By the way, they are not only used by fishermen but in all other water-sports. They are also becoming popular with truck drivers and for general outdoor activities. The last five years have seen a jump in their sales and are the fastest growing segment in eyewear. Get sunglasses designed for fishing.
More information about polarized lenses
What You Need To Know About IN SHORE Fishing And Sunglasses
To distinguish weed lines when in shore fishing, amber lenses are best. The one disadvantage of amber lenses is that they distort colors and do not allow you to see true colors. If true color is your cup of tea, then vermillion lenses will do the trick while providing adequate weed line vision. Fishing activities enhance light reflected from the surface of the water preventing the viewer from seeing below the surface. Polarized lenses not only eliminate this glare, but enables the wearer to see below the surface as well. In addition, sand at the beach is a source of this same glare. Fishing Sunglasses That Show You The Bottom»
Some good features to look for in
fishing glasses are; light weight, polarized polycarbonate shatterproof lenses, 100% UV protection, lens treatment to prevent water spotting, choice of lens color, non-slip nose pads, adjustable earpieces and a good guarantee...