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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.
Pupil distance can be measured in one of two ways. The first is monocular measurement, which will result in values somewhere between 26-36 mm. The second type is a binocular measurement, in which case the number will typically be somewhere between 54-72mm.he first number is the P.D. number we require to make your lenses. The second number (63) is the near pupil distance. This number is only needed when reading glasses are required.