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What is PD? PD stands for Pupillary Distance, which is the distance between your pupils in millimeters, Your PD is very important for accurately fitting your lenses to achieve vision acuity. How to read PD? 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, A Monocular OD is written as two numbers, for example "32/30", "32" represents the PD for the right eye, and "30" for the left eye. How to measure PD? Step 1: Stand with a friend facing you and place a millimeter ruler on the bridge of your nose. Keep the rule "0" measurement exactly in line with the center of your left pupil. Hold the ruler straight. Step 2: Let your friend read the measurement between the left pupil and the right pupil while you look straight ahead. Step 3: For measuring a PD with high accuracy, please do it 3 times and take an average number of them as the final PD measurement. ---------------------------------------------------------- Follow Us On Instagram: @firmoo_optical Pinterest: Firmoo Twitter: @firmoo Facebook: @FirmooGlasses

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