Measure your pupillary distance (PD) with a credit card

PD is the distance between your pupils, and it's used to help center a prescription correctly in your frames.

Credit cards have a globally standardized width of 85.60 mm and a height of 53.98 mm. Your interpupillary distance is calculated by detecting the size of the credit card in the image.

The effective error of interpupillary distance is 2mm.

Our measurement results include both single-PD and dual-PD.

Please read the following steps before using our interpupillary distance measurement tool.

1. Please take off your glasses
  • If you are wearing glasses, please take it off first.
  • Please ensure you are in a well-lit environment with a clean background.
2. Adjust your screen and look directly at the camera
  • Please look directly at the camera.
  • Please place your face in the center of the screen.
3. Please place credit card under your nose and snap a pic
  • Please keep your face forward and level.
  • Please ensure the credit card color contrasts sharply with the skin tone.
  • Please keep credit card and face parallel.
  • Please keep credit card touching your face.
  • Please take multiple measurements and calculate the average.
Start Measurement