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What is a PD - Pupillary Distance?

Your pupillary distance or “PD” is the distance between the centre of your pupils.   It is an important piece of information that we need to deliver the very best vision in your new glasses.

An average adult PD can be between 58 and 68 millimeters. If your prescription shows two PDs,  for example 66/63 then the larger number will be your distance PD and the lower one will be your reading PD (our eyes converge when reading so our PD is smaller).

If only one PD measurement is present you should assume this is your distance PD.   Typically your reading PD will be around 3mm lower than you distance, but this should be confirmed by your optician.

Occassionally an optician may write your mono PD’s (one for each eye), eg 34/32.   To calculate your binocular PD just add the 2 numbers togeter, in this example it would be 66mm.   You can add a note in the additional info box when ordering to list your mono PD measurements.  Recommended when ordering Varifocals lenses.

Fax: +44 (0)1843 833 247

Superdrug Opticians
Lockwoods Yard
The Grove
Westgate on Sea

Call Centre Opening Hours
Monday to Friday: 9am - 5pm
Saturday: Closed
Sunday: Closed

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