**If you need to order a number of systems, you must provide the following complete information:** Myopia 2. Astigmatism 3. Astigmatic axis 4. Pupil distance **Lens introduction:** 1.56 refractive index (generally ultra-thin) Taiwan safety lens, optical material with good transparency and clarity. **Lens color:** Powdered tea brown: (50% color depth) The tea-brown lens allows the ratio of yellow-brown light to the eye to increase, and the ratio of blue light to the eye is less. It can be said that there is a blue light filtering function and the visual contrast and sharpness are improved. In addition, the brown-brown lens absorbs the blue light scattered by the water vapor in the air, filters out the short-wave blue light, enhances the contrast, sees the fineness, and improves the visual contrast in the outdoor. Therefore, many athletes choose the brown-brown sunglasses and also drive the sunglasses during the day. Good choice. https://c1.staticflickr.com/5/4848/45858987222_cf8d1a18f7_b.jpg **Frame size:** A 50mm B 22mm C 150mm D 132mm E 49mm **Note** 1. Commodity equipment: mirror box, fiber cloth, dust jacket. 2. If there is optometry or maintenance adjustment requirements, you can go to the "aura-optica" official website to find a cooperative store to inquire.