How to Measure Your PD?
1
Download PD ruler

Download PD ruler
Down load our PD ruler Or find a ruler with a millimeter scale.
2

Mirror or Friend
Stand 8 inches (20 cm) away from a mirror or a friend. Place & hold the PD ruler against your brow. Keep your face straight.
3

Align to Zero
First, close your right eye and align the ruler’s zero to the center of your left pupil.
4

Open Right, Close Left
Next, open your right eye and close your left eye.
5

Your PD
Look straight ahead and read the millimeter line that matches up with the center of your right pupil. This number represents your single PD in millimeters.