Measuring Pupillary Distance at Home

Measuring Pupillary Distance at Home

What is Pupillary Distance (PD)?

Pupillary Distance (PD), also known as interpupillary distance (IPD), refers to the distance in millimeters between the centers of both pupils. This measurement is crucial to ensure proper alignment of lenses within your child's glasses frames. The industry standard allows for a 2-3mm margin of error in the measurement without negatively affecting your child's vision.

PD is also a fantastic starting point to determine your overall frame size, to get your frame size, or how to get your PD – check out our sizing guide:

If your prescription does not include the pupillary distance, you have a few options:

Contact your eye doctor to check if they have this measurement on file.
Download our app, linked below, which can measure the pupillary distance for you.

If you prefer not to download the app or your phone is incompatible, you can watch our step-by-step video tutorial and follow the instructions below to measure it at home.
If you have any questions or would like assistance in verifying the measurement you obtain, you can send a picture of the measurement tool next to your child's eyes to (616) 202-5844, and we will be glad to confirm their PD for you.

How to Measure Pupillary Distance for Children

Option 1: MOBILE APP

Download our virtual try-on app, which includes a pupillary distance measurement function. Please note that the app is compatible with iPhoneX or newer models.

Option 2: PD RULER

STEP 1: Print the file provided below at actual size using a standard letter-size (8.5" x 11") sheet of paper, or use a measurement tool with millimeters.
PD Tool Downloadable Here

STEP 2: Position the pupillary distance ruler just below your child's eyes, ensuring it remains perfectly horizontal. Align the zero (0) measurement on the ruler with the center of your child's right eye pupil.

STEP 3: Maintain stability while holding the ruler and ask your child to stay as still as possible. Identify the millimeter line that aligns with the center of your child's left pupil. This measurement represents your child's PD. For reference, the typical range for children's PD is between 42-65mm.

STEP 4: Repeat steps 1-3 at least once more to ensure consistent pupillary distance measurements. This will provide the most accurate prescription for your child.

STEP 5: Please record your child's PD number on the prescription received from your eye doctor and email it to us at
By following these guidelines, you can easily measure your child's pupillary distance at home, ensuring their glasses are fitted precisely.

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