Pupillary Distance

What is PD?

Pupillary Distance is the measurement in millimetres of the distance between the eyes and is used to ensure that your lenses are positioned properly to give you clear vision. PD value is required when ordering a new pair of glasses.

How to find out/measure your PD

In order to make your eyeglasses custom to your face, we need to know the distance between your pupils so the centre of the eyeglass lens, which holds the clearest vision, sits directly in front of your pupil.
Note: If you are unable to measure yourself, have someone help you!

You can measure your own PD by following the steps below.

  1. You will need a ruler and a mirror.
  2. Look into the mirror at a distance of about 20cm away.
  3. Place and hold the ruler against your brow keeping your face square to the mirror.
  4. Close your right eye and align the ruler's zero to the centre of your left pupil.
  5. Without moving your head or the ruler, open your right eye and close your left eye. Read the millimetre line that lines up with the centre of your right pupil. This number represents your PD in millimetres.
  6. Repeat this whole process at least 3 times to get a constant measurement.

The measurement you just got is your Distance PD. If you need your PD for prescription reading glasses then you will need to know your Near PD which is calculated as 2mm less than your Distance PD.

For example: Distance PD: 62mm / Near PD: 62 - 2 = 60mm


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