PXV2 in the Gigi Rüf signature edition . The PXV2 combines Dragon's groundbreaking Panotech™ lens system with the super-fast Swiftlock lens change system. The size is right in the optimal range: slightly smaller than the PXV and slightly larger than the popular NFX2. Dragon's Panotech™ lens system features a unique curvature that allows it to wrap around the frame more, for an expanded field of view in a visually appealing design.Lumalens® Silver IonLumalens® technology provides optimised colour and glare protection through an ionised lens coating. The hard coating is scratch resistant and repels dirt, dust, oil and water.Transmittance of visible light: 23 %Bonus lens Lumalens® AmberThe amber lens offers perfect protection in poor visibility. Reduces glare, increases contrast and prevents premature eye fatigue in overcast conditions.Transmittance of visible light: 54 %