How Do I Measure My Own PD?

Pupillary distance, also known as PD, is the measurement of the distance between your pupils in your eyes. This is the black dot in the center of your eyes. This measurement is measured in millimeters, and helps determine the proper lens alignment for your prescription lenses.


How do I measure my own PD??

Follow these instructions to measure your own PD at home:

1) In a well lit room stand around 8 inches from the mirror. Make sure your face is parallel and facing squarely to the mirror. Hold the ruler horizontal beneath your eyes.

2) Close your right eye and align the ruler's 0 measurement to the center of your left eye.

3) Without moving your head or the ruler, open your right eye and close your left eye. Take note of the millimeter measurement line that lines up with the center of your right pupil. This is your PD measurement. This is what is known as your Distance PD. Repeat this action 5 times to make sure you are getting an accurate measurement. If you have trouble making out the measurement, you might want to ask a friend for help.

4) If you require prescription bifocal lenses you will need to provide a Near PD. Simply subtract 3 millimeters from you Distance PD to find this measurement.


Click here to download a printer friendly form to measure your own PD.

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