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What Is PD (Pupil Distance)?
PD (Pupil Distance) is the distance between the centers of your pupils in millimeters, which determines where you look through the lens of your glasses. It should be as accurate as possible.
Since faces are not always symmetrical, so some people will have two PDs, also known as “Dual PD”. Dual PD is the pupillary distance between each pupil's center to the nose's bridge. It is written in the following notation: 32/30. The first number is the right eye.
How to Measure Your PD?
Step1: Stand in front of a mirror approximately 8 inches away and hold the ruler against your brow.
Step2: Hold the PD ruler over your eyes and close your right eye. Center the 0 over your left pupil.
Step3: Close your left eye and open your right . The number you see over your right pupil is your PD.
Step4: Repeat this process at least three times to ensure you have an accurate measurement.