Find Your Child's PD

PD (pupillary distance) is the measurement in millimetres between your child's pupils. It is required to centre the lenses correctly in the frame.

      For children, professional PD measurement is strongly recommended. A child's PD changes as they grow, and an error of even 1–2mm can cause discomfort, especially with stronger prescriptions. Your optician will measure this during an eye test — ask them to include it in writing.
    

Where to find it

📄 On the prescription

Look for "PD", "P.D.", "IPD", or "Inter-Pupillary Distance". It may appear as a single number (e.g. 58) or two numbers (e.g. 29 / 29).

🏪 Ask the optician

Your optometrist or Dispensing Optician will have measured it. They are legally required to provide the prescription — you can also ask them to confirm the PD.

Single PD vs Monocular PD

Single PD

One total number: the distance between both pupils. Example: 58. Enter this number directly.

Monocular PD (two numbers)

Two separate measurements from nose centre to each pupil. Example: 29 / 29. These add up to the single PD (58). Enter the total.

Typical PD ranges for children

Age	Typical PD range
3–5 years	44–52mm
6–9 years	50–56mm
10–13 years	54–60mm
14–16 years	57–64mm

These are guidance ranges only. Individual measurements vary. If your child's PD seems outside range, verify with your optician before ordering.

Do not attempt a home PD measurement for children as a primary source. Children's eyes are less predictable to measure and the stakes of an error are higher than for adults. If you do not have the PD, contact your optician — they can confirm it quickly, often without an additional charge.

Have your PD? You're ready to order.

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