What Is PD?
Pupillary Distance (PD) is the distance between the centres of your pupils, measured in millimetres. This measurement ensures that your lenses are correctly aligned with your eyes for clear and comfortable vision.
If your PD is not listed on your prescription, you can measure it yourself using a ruler and a mirror.
Method 1 – Measure Using a Mirror
You can measure your own PD in under 30 seconds using just a millimetre ruler and a mirror.
Stand about 20cm away from a mirror.
Hold a millimetre ruler against your brow or nose.
Close your right eye and align the 0 mark with the centre of your left pupil.
Without moving the ruler, open your right eye and close your left eye.
The measurement at the centre of your right pupil is your PD.
Typical adult PD ranges from 54mm to 74mm.
Measure your Pupillary Distance (PD)
It only takes 30 seconds
Align the 0mm mark of a millimetre ruler with the centre of your left pupil. Then, look straight and read the mm number lined up with the centre of your right pupil.
Most adults: 54-74mmMethod 2 – Ask a Friend
You can also ask someone to measure your PD while you look straight ahead — this can sometimes be more accurate.
Look directly forward at a distant object.
Your helper places a millimetre ruler across the bridge of your nose.
They measure the distance between the centres of both pupils.
Why PD Is Important
Your PD ensures the optical centre of the lenses aligns with your eyes. Incorrect PD measurements may cause:
Blurred Vision
Eye Strain
Discomfort
Tip
If you already own glasses that fit well, your optician may be able to tell you your PD from your previous measurements.
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