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® pink ionized 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: 60 %bonus lens lumalens® dark smokethe dark smoke lens offers perfect protection in changeable weather conditions. reduces glare, increases contrast and prevents premature eye fatigue in overcast conditions.transmittance of visible light: 22 %