Pupillary Distance is a required measurement when making eyeglasses. If your prescription does not indicate the PD measurement, you can measure it yourself with a millimeter ruler. Follow these simple steps:
1. Rest a mm ruler on the bridge of your nose just in front of your eyes. Look straight ahead and line up the 0mm marker with the center or one pupil.
2. Read the ruler in a mirror, or have someone at the same height as you read it.
3. The mark that lands in the center of the other eye is your Pupillary Distance.
4. Repeat these steps 2-3 times to make sure your results are accurate.