: Use the Zenni Virtual PD Tool which uses your webcam and a standard magnetic card (like a credit card) for scale.
: Ensure it includes your Sphere (SPH), Cylinder (CYL), and Axis if you have astigmatism. buy glasses online z
PD is the distance in millimeters between the centers of your pupils, which is vital for centering the lenses correctly. : Use the Zenni Virtual PD Tool which
: Zenni now requires the date of your prescription to ensure it is current. 2. Measure Your Pupillary Distance (PD) buy glasses online z
You must have an up-to-date prescription from an eye doctor.
: You can also use a millimeter ruler and a mirror. The average adult PD is between 54–74 mm. 3. Choose the Right Frame Size How to Order Glasses Online