avtom影院永久转四虎入口_欧美成人禁片在线观看网址_调教双性少年sm文h_国产亚洲综合一区柠檬导航_少妇白浆午夜福利_男人舔女人天堂网站_欧美激情文学在线观看_国产一级爱做c片免费昨晚你_五月婷婷激情四射四虎_麻豆蜜桃经典乱码视频

Daily general correction type

Youlan? daily universal corrective lenses are made of organic polymer resin materials. The interior is connected by a polymer chain structure to form a three-dimensional network structure. The molecules are relatively loose and can generate space for relative displacement, which improves the toughness of the lens, enhances its impact resistance and is not easy to break.

Youlan? lens adopts precise flat base curve design, which can reduce the visual defects of spherical aberration. The aspheric lens is also designed with a flat base curve, and the field of view is more natural and realistic. In the case of high refractive power, it can reduce the visual distortion of the edge of the lens. For consumers with high vision, it is recommended to choose a high refractive index aspheric lens. The traditional high-number spherical lens is deformed and distorted when viewing objects, which limits the vision of the wearer.

Youlan? The surface of the lens is hardened and coated. Hardening treatment is to increase the surface hardness of the lens; coating treatment is to increase the light transmittance of the lens and make the wearer see more clearly; the general light transmittance of the lens after coating can reach more than 97%, which is clear and bright. The film layers have different special functions and colors. The film layers are classified as: single hard, green film, blue film, and anti-glare film; from the functional classification: waterproof, dustproof, anti-static, anti-glare, anti-radiation, etc. alone or Compound function. Consumers can choose according to their personal preferences.