Attention: The link is configured with 1.56 refractive index lens, suggestion diopter(SPH) is 0.00 to +/- 3.00. If you need high refractive index lenses, please contact the customer service If your cylinder(CYL) ＞ 2.00, you have to pay an additional $10 customization fee. If your cylinder(CYL) ＞ 4.00, you have to pay an additional $20 customization fee. How to use the anti-slip ring: Anti-fog cloth usage: For car windshield, eyeglass lenses, bathroom mirrors and other small and flat surfaces, directly use it to wipe the parts that need anti-fog. After wiping, let it dry naturally, it can play the anti-fog effect in a period of time. Attention: 1. Anti-fog cloth to wipe glasses can be reused 10 times. 2. Place the anti-fog cloth in the bag promptly after use to avoid rapid evaporation of anti-fog liquid. The anti-fog cloth will have no effect after drying. Looking for functional customized glasses. You've come to the right place! We offer a rich variety of customization options. Ontact our customer service now for a link to the lenses !!! 1.High refractive index lenses : Correct high prescriptions, thinner than regular ones. 2.Progressive multifocal lenses : Have multiple focal zones for clear vision at all distances. 3.Bifocal lenses : Two zones, upper for far, lower for near, with a visible line. 4.Astigmatic lenses : Fix vision blurriness from uneven eye refraction. 5.Impact-resistant lenses : Made of special material like PC, resist impacts, protect eyes. 6.Photochromic lenses : Automatically change tint with light intensity. 7.Tinted lenses : With added color, for style or better contrast. 8.Polarized lenses : Cut glare via a unique axis, great for driving and water sports. 9.Anti-fog lenses : Treated to avoid fogging in damp conditions. 10.Anti-glare lenses : Reduce strong light disturbance for clear sight.