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1 Measure the distance between the two dots on your lenses with a millimeter ruler. 2  That's your distance PD. 3  If you need a near PD for reading or computer glasses, just do the same procedure but focus instead on the object you will be looking at, either reading material or computer monitor.
The distance between the centre of one pupil to the centre of the other pupil is the PD. Prescription glasses are made so that the distance between the optical centres of the glassesâ lenses, is the same as your PD. Once you are an adult, your PD does not change but PD varies from person to person.