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: Ensure it includes your Sphere (SPH), Cylinder (CYL), and Axis if you have astigmatism.

: Zenni now requires the date of your prescription to ensure it is current. 2. Measure Your Pupillary Distance (PD) buy glasses online z

PD is the distance in millimeters between the centers of your pupils, which is vital for centering the lenses correctly. : Ensure it includes your Sphere (SPH), Cylinder

: Use the Zenni Virtual PD Tool which uses your webcam and a standard magnetic card (like a credit card) for scale. buy glasses online z

You must have an up-to-date prescription from an eye doctor.