Dragon NFX2 Replacement Lens. Replacement or spare lenses for your Dragon NFX2 goggles. Newly expanded for 2018, Lumalens color optimized lens technology offers crystal clear visibility across the entire spectrum of light conditions. Lumalens is engineered to deliver enhanced contrast and clarity, enhanced depth perception, all while reducing eye fatigue. By filtering out harmful lightwaves attributed to haze, while letting in light that intensifies color recognition. Lumalens achieves a new standard of performance.