PD stands for pupil distance and which means the distance from the center of one pupil to the other. PD is an important factor, And it will tell you where to look through the lens of your glasses, and should be as accurate as possible. This is extremely important for people with strong prescriptions. Normally, PD value can be found on your prescription.
Step1
Position yourself arm’s length from your friend or yourself approximately 8 inches (20cm) away from a mirror. Please measure your PD 2-3 times to ensure you get the accurate results.
Step2
Close your right eye and align the 0 mm over the center of your left pupil.
Step3
Close your left eye and note the reading directly over your right pupil. That will be your Total PD.
Step4
You also need to measure the distance from two pupils to the center of nose respectively to make sure that if you have two PDs(OD & OS).
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