a retro design with modern features . experience a blend of retro style and modern technology with the d3 otg split. dragon has adapted the frame of the d3 to fit easily over optical glasses. in addition, more hinges and an improved strap attachment ensure a better fit. high-quality lumalens® lenses and anti-fog treatment round off the d3.lumalens® red ionlumalens® technology offers optimised colour and glare protection through an ionised lens coating. the hard coating is scratch-resistant and repels dirt, dust, oil and water.light transmission 23 %