Far more than a fashion accessory, serious sunnies are essential marine safety aids that enhance vision while reducing eye strain and fatigue.
Polarised lenses are superior when it comes to tackling intense glare and UV radiation. The filter shields against horizontal light waves, enabling you to see below the water surface with sharper contrast and colour perception.
Fish, reefs and structure will be clearer, as will navigation markers, swimmers and other hazards when driving into blinding early-morning or late-afternoon sunlight.
Given that boating life is hard on sunglasses, look for premium brands that generally have greater durability.