Why Fishermen Need Polarized Sunglasses

More and more fisherman wear polarized sunglasses when fishing, but why? Is it necessary to do so? Here we analysis why fisherman need polarized sunglasses.

As you might know,the glare of the sun on the sea is highly polarized, sometimes it's almost completely horizontally polarized.
The polarized sunglasses contains a polarized filter with the transmission axis oriented vertically to block the light reflected by the water surface.
With polarized sunglasses the sea appears more transparent, thus it's quite convenient for fishermen.