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

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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

: 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 buy glasses online z