Your pupilary distance (PD) is the distance between the centre of your pupils and we need this measurement to help centre your prescription in your lenses. 📏
Your PD is something you can measure yourself using a millimetre ruler and a mirror or if you have a webcam you can also use our accurate PD measuring tool. Here is a link to our help sheet to guide you through the measurement and to our measuring tool: https://iolla.com/pages/pd