男人插女人在线观看_日本特级淫片免费_欧美午夜福利理论片久久_日韩欧美视频大全_精品国产欧美一区二区免费_同城约一百块 qq_国产00高中生在线视频_91精品三级在线观看播放_每日热点资讯_免费不卡A级毛片

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.