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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.
Most children have a PD. between 43 - 54 mm. Take a few measurements. for consistency. Try not to move your head or the ruler. First open your right eye and. close your left eye. Look straight ahead and read the millimeter line. that matches up with the center of your right pupil. This number. represents your single PD in millimeters. (20 cm)