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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.
Ask Your Doctor. You can also get this information from your doctor or from a licensed optician. If you have two PD numbers on your prescription, you have either been given both the Distance/Reading or Right Eye/Left Eye. Here's what you do: Two same number: (Ex. 30/30) Add them together (Ex. 60 is your PD). Two low numbers*: (ex. 30/31) The first number is for the right eye (O.D.) and the second number is for the left eye (O.S.). *Place it in the Customer notes section of the order form. Two high numbers: (Ex. 62/59) First number is your Distance PD and the second is your Near PD (for reading-only glasses). As a Guideline: Most adults' PD's are between 55-65. Most kids' PD's are between 42-54.