Getting Started

Print PD ruler

Print PD ruler at 100% size.
Do not use ‘scaling’ or ‘fit’ setting.
Print setting should be ‘actual size’.


Fold printout along the dotted line.

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.

Ready. Set. Measure!

Take a few measurements for consistency.

Most adults have a PD between 54 – 74 mm. Most children have a PD between 43 – 54 mm.

Align to Zero

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

Open Right, Close Left

Next, open your right eye and close your left eye.

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.

PD Ruler Preview

This is an example of the printable PD Ruler. Ruler measurements are in millimeters.

Note: web view not to scale.

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