Pupillary distance with a credit card.

Take a clear front-facing photo with a standard-size card positioned as instructed by the measurement tool. The card provides a known scale so the pupil-to-pupil distance in the image can be estimated in millimeters. Keep the card level and both pupils visible. A photo alone needs a reference to translate pixel distances into physical dimensions. A standard-size card provides a known reference for estimating PD in millimeters.

A standard ID-1 card is 85.60 mm wide and 53.98 mm high. Its known dimensions provide a reference for converting image pixels to millimeters. The card is a measuring reference; no payment is involved.

Yes, if it has the same standard ID-1 dimensions and the reference edges are clearly visible. A blank card of the correct size is preferable to exposing personal or payment information. Do not use a resized printout or a card with different dimensions.

Follow the capture instructions for the specific tool. In a forehead-based capture, hold the card horizontally against your forehead above your eyebrows, without covering your pupils. Keep the card facing the camera; tilt and differences in depth between the card and eyes can affect scale.

Accuracy depends on camera quality, card position, head alignment, lighting, and the measurement method. A card provides a scale reference but does not remove perspective errors. Repeat the capture and ask your optical provider to confirm the PD needed for your lenses, especially for progressive or complex prescriptions.

Pupillary distance (PD) and interpupillary distance (IPD) commonly describe the distance between the centers of the pupils. A single binocular value is different from separate right and left monocular values. Follow your optical provider’s requirements rather than assuming one value can replace the other.

Yes. Launch the card-based PD demo and follow its capture guide with a standard-size card. Use a blank card of the same size or conceal payment details while keeping its edges visible.

Use a standard-size card, a clear front-facing photo, and even lighting. Keep both pupils and the reference edges visible. Use a blank card of the same size or hide all payment details without obscuring the outline.

Embed the Makemetryon iframe with your public key, then send { open: "measurements-ipd-pro" } through postMessage to launch card-based pupillary distance measurement. Follow the capture guide in the widget.

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