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.
Take a frontal face photo that you holding a credit card-sized plastic or paper under your nose as demonstrated in the following image.
Upload the photo, then zoom in the photo and place the center of the sight in your pupil.
Zoom out and drag the image so that the card is finally placed exactly where the fake card is, then push done button.