What is a PD?

How do I read my pupillary distance (PD) number?

Pupillary distance, PD, is the measurement (in millimeters) of the distance between your pupils and used to ensure your customized lenses are centred directly in front of your pupils. Refer to the chart below to learn how to read your PD number.

If my PD is written as Commonly symbolized as Your doctor has measured your And should be entered as
63 PD (OU) Binocular PD for both eyes (OU) which is used for single vision glasses. 63 - exactly what's on your prescription
33/30 PD (OS)/PD (OD) Monocular PD for your left eye (OS) and right eye (OD) which is used for single vision glasses. 63 - just add 33+30 together
59/63 Near/Far PD Near PD for both eyes which is used for reading glasses. 59 - your near PD
Far PD for both eyes which is used for progressive/bifocal glasses. 63 - your far PD

How do I measure my pupillary distance (PD)?

If your eyeglasses prescription does not indicate your PD, you will need to measure it yourself since PD is a required measurement when making eyeglasses.

pd ruler

Download PD Ruler Adobe Reader Download

Follow these simple steps to measure your PD at home:

  1. Place a millimeter ruler up against your eyes, resting it on the bridge of your nose.
  2. Line up the starting point, 0 mm, with one of your pupils.
  3. Look straight ahead in a mirror or have someone else read the ruler. If someone else is reading the ruler, they should be at the same height as you.
  4. Write down the measurement in front of your other eye - that's your PD!
  5. Repeat these steps 2 or 3 times to ensure accuracy.

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