Polarization is particular critical to angler. Light reflected off surface of water creates glare, making it tougher to see. Polarized sunglasses feature a special filter built into the lenses that blocks the natural glare and haze. This allows you to spot fish on or just below the surface. Shoals, oyster bars, rocks and other obstructions stand out while the boat is underway too. Polarization sometimes makes it harder to read LCD electronic displays, and you might need to remove or pull down the glasses to monitor the chart-plotter.