Full auxiliary lens Built-in auxiliary lens with full examination of visual function. First-class feel Precise lace design with clear location feedback of every movement. Multilayer coating Multi-layer coating to reduce glare and improve visual comfort. Cross-optical lens and accurate color filter lens. Unique butterfly appearance, dazzling handle wheel, exquisite workmanship and comfortable feeling. All optical lenses adopt advanced coating process. Precise location when turning the cross cylinders. Full examination of visual function and accurate and comfortable measurement.