Nomi Optical Fit Guide

How to Measure Your Pupillary Distance (PD)

Your Pupillary Distance ensures the optical centers of your prescription lenses align with your visual axes for sharp, comfortable vision.

Pupillary Distance (PD) is the distance in millimeters (mm) measured between the centers of your pupils.
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Why Isn't PD Always Included in Australia?

Australian Regulation

In Australia, optometrists are legally required to provide your eyeglass prescription upon request. However, they frequently exclude the Pupillary Distance (PD) because it is legally classified as a "frame fitting measurement" rather than part of the clinical optical prescription diagnosis.

Don't worry — measuring your PD at home is fast and easy using our interactive Camera PD Scanner or our simple Mirror & Ruler Method below!

2

Method 2: Traditional Mirror & Ruler Method

Recommended / Most Accurate

All you need is a rigid millimeter ruler, a mirror, and good room lighting.

💡 Accuracy Note: Method 2 is generally more accurate. If in doubt about your measurement, we recommend using both methods to cross-check and verify your result.
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Clean Mirror

Bathroom or wall mirror at eye level

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Millimeter Ruler

Rigid ruler with clear mm markings

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Good Lighting

Front-facing light to highlight pupils

Step-by-Step Method

1

Position Yourself

Stand directly in front of a mirror at arm's length (45–50 cm). Holding the ruler flat straight across your brow line at arm's length ensures your eyes stay focused straight ahead for an accurate distance PD measurement.

2

Align 0 mm Mark with Left Pupil

Close your right eye and open your left eye. Align the 0 mm mark of the ruler with the exact center of your left pupil (the black center of your eye).

3

Read Measurement at Right Pupil

Keeping the ruler still, open your right eye and close your left eye. Read the millimeter measurement directly over the center of your right pupil.

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Record Your Number = Your PD

That number (e.g. 63 mm) is your Pupillary Distance! Average adult PD values fall between 54 mm and 74 mm.

💡 Pro Tip for Maximum Accuracy

If it is difficult to spot your pupil centers due to dark irises (the coloured part of your eye), measure from the outer edge of your left iris to the inner edge of your right iris. Because irises are symmetrical, this measurement equals your exact pupil distance!

Single PD vs. Dual (Monocular) PD

Single (Binocular) PD

A single number representing the total distance between both pupils (e.g., 63 mm). This is standard for 90% of prescription eyeglasses.

Dual (Monocular) PD

Two numbers measuring from the bridge of your nose to each pupil center (e.g., 31.5 / 31.5 mm). Dual PD is recommended for progressive lenses or strong prescriptions.

📋 Prescription & Optical Accuracy: Please verify that your optical prescription is current and valid, and that all prescription numbers and Pupillary Distance (PD) parameters are entered accurately before submitting your order.

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