crystaloptical Mon, 12 Oct 2026 14:13:00 +0200 http://crystaloptical.onlc.fr/3-Blog The 1.60 single Vision lens has index of 1.60 and is made of acrylic and MR-8. Thinner lenses reduce the overall weight of the glasses. The aspherical design of sv lenses effectively reduces aberrations, expands the field of view, and makes the visual quality more natural and clear ‌. Myopia above 400 degrees is ... Mon, 12 Oct 2026 14:13:00 +0200 http://crystaloptical.onlc.fr/3-Blog/p6acc888e9c22b-Wholesale-161-Single-Vision-Lenses-Asphe.html 6acc888e9c22b The progressive lenses is to regulate and meet the visual needs of the wearer in different eye distances (near → middle → far) and different eye environments through multi-focus design. The corridor  design is responsible for the gradual and continuous transition from the distance to the near degree, so as to use ... Mon, 12 Oct 2026 14:13:00 +0200 http://crystaloptical.onlc.fr/3-Blog/p6acc88a4e8d5f-CR-39-Uncoated-Prescription-Multifocal-P.html 6acc88a4e8d5f The main function of the UV400 lens is to prevent UV damage to the eyes. The UV400 lenses filter out more than 99% of UV rays, especially those with wavelengths below 400 nanometers, providing close to 100% UV protection ‌12. This 1.56 optical lens can effectively protect the eyes from UV damage and reduce the ... Mon, 12 Oct 2026 14:13:00 +0200 http://crystaloptical.onlc.fr/3-Blog/p6acc88ba42112-156-UV400-Protection-Aspheric-NK55-Resin.html 6acc88ba42112 1.499 HC lens is Hard Coated single vision lens, the material is CR-39. CR39 single vision lenses have a high Abbe number, high light transmission, which means that they can provide clearer visual effects, reduce dispersion phenomenon. In addition, the CR-39 material is relatively light, which makes the wearer more comfortable.   ... Mon, 12 Oct 2026 14:12:00 +0200 http://crystaloptical.onlc.fr/3-Blog/p6acc886aa5915-China-Factory-Wholesale-Price-149150-Har.html 6acc886aa5915 This 1.499 UC lens is uncoated single vision lens. The material of the single vision lens is CR-39. CR39 single vision lenses have a high Abbe number, high light transmission, which means that they can provide clearer visual effects, reduce dispersion phenomenon. In addition, the CR-39 material is relatively light, which ... Mon, 12 Oct 2026 14:12:00 +0200 http://crystaloptical.onlc.fr/3-Blog/p6acc887d0efbf-CR39-1499-Single-Vision-Uncoated-Plastic.html 6acc887d0efbf