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WHAT IS PUPILLARY DISTANCE AND WHY IS IT IMPORTANT Pupillary Distance (or PD) is one of the numbers that you will need to enter in your prescription while buying your glasses online. It measures the distance in millimeters (mm) between the centers of your pupils. It is important to have an accurate PD to ensure that you're looking through the correct spot in your lenses and have clear and the most accurate vision at all times. The average PD for adults is between 54mm to 74mm, whereas, the s...