classic goggles with frame . the dragon d1 otg is a classic goggle, without a lot of frills, with one frame and otg technology. so you can wear your prescription glasses under your goggles and enjoy full vision.bonus lens lumalens® dark smoke the dark smoke lens offers perfect protection in changeable visibility. reduces glare, increases contrast and prevents premature eye fatigue in overcast conditions.transmittance of visible light: 22 %bonus lens lumalens® amberthe amber lens offers perfect protection in bad weather conditions. reduces glare, increases contrast and prevents premature eye fatigue in overcast conditions.transmittance of visible light: 54 %