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I want to order glasses online with my prescription. What's the difference between single PD and dual PD (pupillary distance)? - Quora
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Amazon.com: By Dr. Chi My PD Ruler. This is a Millimeter Ruler for Accurate Measurement Online Eye Glasses Adults and Children Slide Record Your PD, White Box, Red and Black Prints, 15x5x2.5cm,
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How Important is Your PD (Pupillary Distance) When Shopping for Glasses Online? | SelectSpecs Glasses Blog
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Headaches & Fatigue: Measure Your Pupillary Distance (PD) - Endmyopia® - The Reduced Lens Method™: Improve Eyesight Naturally
![How to Measure Pupillary Distance (PD)? | Rx-Able | We use Essilor prescription lenses, the best brand for the sharpest vision. How to Measure Pupillary Distance (PD)? | Rx-Able | We use Essilor prescription lenses, the best brand for the sharpest vision.](https://cdn.shopify.com/s/files/1/0068/2154/3988/files/RX-ABLE-PD-Instructions.png?4330)