How to Measure Pupillary Distance (PD)

What is Pupillary Distance? 

Pupillary Distance (PD) measures the distance between your pupils. The average adult’s PD is between 54-74 mm; kids' are between 43-54 mm. Pupillary distance must be accurate for prescription glasses to properly work. You can either get it from your optometrist or measure it yourself. 

How to measure your PD?

1. Stand 8 in. away from a mirror.
2. Hold a ruler against your brow.
3. Close your right eye then align the ruler’s 0 mm with the center of your left pupil.
4. Look straight then close your left eye and open your right eye.
5. The mm line that lines up to the center of your right pupil is your PD.
6. Repeat steps 2-3 times to get a consistent readings.