Measure your pupillary distance (PD)
Pupillary distance (or PD) refers to the distance between your two pupils. It’s necessary to center a prescription in your frames for clear, accurate vision.
You can use our online tool here to measure your PD using just a photo.
![](/Public/default/images/about/pd-ex-1.jpg)
Take a frontal face photo that you holding a credit card-sized plastic or paper under your nose as demonstrated in the following image.
![](/Public/default/images/about/pd-ex-2.jpg)
Upload the photo, then zoom in the photo and place the center of the sight in your pupil.
![](/Public/default/images/about/pd-ex-3.jpg)
Zoom out and drag the image so that the card is finally placed exactly where the fake card is, then push done button.