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Your eye doctor will usually measure your PD during an eye exam ask for it to be included on your prescription. If not here is 5 ways to do it yourself at home.This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult’s PD is between 54-74 mm; kids’ are between 43-58 mm. Here are the 5 steps:

1) Stand 8 in. away from a mirror.

2) Hold a ruler against your brow.

3) Close your right eye then align the ruler’s 0 mm with the center of your left pupil.

4) Look straight then close your left eye and open your right eye.

5) The mm line that lines up to the center of your right pupil is your PD

What is PD? Learn More