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1. Selection Frame 2. Selection Lens 3. Provide data 4. Confirm order Lenses Explaination : Standard Acrylic aspheric Air Lens Our 1.56 index thin, Lightweight, and impact-resistant CR-39 lens is up to 17% thinner than industry standard. Plus its: ●Scratch Resistant    ●UV Protective    ●Aspheric    ●Thin ●Anti reflection Aspheric Lenses suggestion power: Myopia-------SPH:   -0.00~-3.00;      CYL: -0.00~-2.00 Hyperopia---SPH:  +0.25~+3.00;     CYL:+0.00~+2.00 (ADD 10$) Cylinder------CYL:  +2.00~+4.00 or CYL:-2.00~-4.00 (ADD 10$) Standard MR-8 aspheric Lens Our 1.61 index thin, Lightweight, and impact-resistant CR-39 lens is up to 26% thinner than industry standard. Plus its: ●Scratch Resistant    ●UV Protective    ●Aspheric    ●Thin an light ●Anti reflection Aspheric Lenses suggestion power: Myopia-------SPH:   -0.00~-6.00;      CYL: -0.00~-2.00 Hyperopia---SPH:  +4.00~+6.00;     CYL:+0.00~+2.00 (ADD 10$) Cylinder------CYL:  +2.00~+4.00 or CYL:-2.00~-4.00 (ADD 10$) Standard MR-7 aspheric Lens Our 1.67 index thin, Lightweight, and impact-resistant CR-39 lens is up to 40% thinner than industry standard. Plus its: ●Scratch Resistant    ●UV Protective    ●Aspheric    ●Ultar thin ●Anti reflection Aspheric Lenses suggestion power: Myopia-------SPH:   -0.00~-8.00;      CYL: -0.00~-2.00 Hyperopia---SPH:  +4.00~+8.00;     CYL:+0.00~+2.00 (ADD 10$) Cylinder------CYL:  +2.00~+4.00 or CYL:-2.00~-4.00 (ADD 10$) Standard ultrathin ACR Air Lens Our 1.74 index thin, Lightweight, and impact-resistant CR-39 lens is up to 60% thinner than industry standard. Plus its: ●Scratch Resistant    ●UV Protective    ●Aspheric    ●The thinnest ●Anti reflection Aspheric Lenses suggestion power: Myopia-------SPH:   -0.00~-12.00;      CYL: -0.00~-2.00 Cylinder------CYL:  +2.00~+4.00 or CYL:-2.00~-4.00 (ADD 10$) Aspheric Lenses : Aspheric Lenses undistorted edge, see the thing as real ●Thinner    ●Lighter    ●Flatter Spheric Lenses distorted edge, distortion Difference between Spherical Lens and Aspherical Lens Generally speaking, spherical lens are thick and the image through the lens will be distorted. aspherical lens are thinner, lighter and more comfortable for wearers. Aspherical lens have wide vision and the image through the lens is more real and natural. Wearers will not feel tired after wearing aspherical lens for a long time. Anti-blue Lenses : Ordinary lens BlueReflect Lens DIGITAL SCREEN PROTECTION Help protect your eyes while using devices such as   phones,computers,and tablets provide Lenses: 1.56 Anti-Blue 1.61 Anti-Blue 1.67 Anti-Blue 1.74 Anti-Blue Photochromic Lenses: indoor Low light glare LIGHT ADJUSTING  (Provide Lenses:1.56 Photochromic  1.61 Photochromic  1.67 Photochromic 1.67 Photochromic) Lenses that darken when exposed to outside light and remain clear inside Optometry Data Explaination : Explaination: 1.OD-RIGHT = Right Eye   OS-Left = Left Eye 2.Sphere (SPH)=Spherical, is the strength of our prescription, "+"refers to farsightedness and presbyopia, "-"refers to nearsightedness. If "PL" or "Plano" is stated at the place of SPH on your prescription, please enter 0.00 for this option. 3.Cylinder (CYL) = Cylindrical, is the diopters degree of the astigmatism. This number also has "+" or "-" signs. If "DS"or "SPH" or "spherical" or "PL" is stated at the place of CYL, it means you have no astigmatism and 0.00 is the option required to choose. 4.AXIS, is a number between 0 and 180 degrees, and means the orientation of your astigmatism. There is no sign before this number. 5.PD-PUPILLARY DISTANCE = Pupillary Distance PD (OU), written as "64", means the Binocular PD which is   for both eyes. PD (OD), means the Monocular PD for the right eye, PD   (OS), means the Monocular PD for the left eye. Please do check frame size The ruler in the picture cannot be used to measure your old glasses. Please use your measuring tool to check the size of old pair   of glasses.(2-3mm difference acceptable) Thickness of the lenses depends on a few factors: 1. Prescription strength. The stronger the prescription, the thicker the lens, all else being equal. 2. Frame selection/fit. All else being equal, the larger the size of the lens, the thicker it gets (thickness proportional to size). 3. The higher the index of refraction, the less of a material is necessary to bend, or focus, the light in the same way for the same prescription. So, higher index material lenses will also reduce thickness and "Coke bottle" effect. Helps for common discomforts 1. New glasses 2. New Prescription 3. The change of frame shape may cause discomfort. 4. Discomfort caused by discordance of prescription and lens index. 5. Discomfort caused by the spherical lens. First time to try progressive Lenses. It is of great importance to learn how to use progressive glasses and may take several weeks to get used to. If you still feel uncomfortable after several weeks, you could change to bifocal glasses or single vision for reading/distance.