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How To Measure Your Pupillary distance (PD)
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Stand 8 in. away from a mirror.
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Hold a ruler against your brow.
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Close your right eye then align the ruler’s 0 mm with the center of your left pupil.
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Look straight then close your left eye and open your right eye.
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The mm line that lines up to the center of your right pupil is your PD.
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Average pupillary distance for an adult is between 48mm-73mm. The range for children is approximately 41-55mm.
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