Coastal.com Help Center
How Do I Measure My Pupillary Distance (PD)?
Although you may not see your Pupillary Distance (PD) measurement your prescription, your licensed Eye Care Professional (ECP) will most likely have taken this measurement at the time of your eye exam. We suggest that you first try to contact your ECP and request your PD.
If, for some reason, this is not available you can follow these steps to measure your PD with a millimeter (mm) ruler:
- Place a mm ruler up against your eyes, resting it on the bridge of your nose.
- Line up the starting point (0 mm) with your left (or right) pupil. This measurement is only accurate if you are looking straight ahead.
- Look at yourself in the mirror or have someone else read the ruler. If someone else is reading the ruler they must be at the same height as you.
- When the 0 mm mark on the ruler is lined up correctly on the left (or right) pupil the mark that lands in the center of the right (or left) pupil is your distance PD.
- Repeat these steps 2 or 3 times to make sure your results are accurate.