Wohu Optical About Us

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.
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