Rio Vanda frames are cool looking brown slightly curved frames. Rio Vanda is a great option for both fishing activities and casual use. They are available in every possible flite series and lens technology. Rio Vanda has straight temple that makes it very nicely fitting frame when using it on top of the headwear. The lens color determines how much light will pass through a lens. To keep vision optimal, you need less light in sunny conditions and more in cloudy weather.