'PD' or Pupil Distance is the distance between your pupils in millimetres. This measurement is needed when prescription lenses are being mounted in your optical frames. The average being 63mm, common PD's range from 57mm to 68mm.

If this measurement is not correctly taken then it can cause blurred vision and/or headaches, as this dictates where the lens should be in relation to your eyes. It needs to be in front and centre of your pupils in order to minimise any distortion.

We would recommend trying to get an optician to measure this as this is very important and we can not make the glasses without this. If you can't get it from your optician please see the information below.

We recommend using the 'Glasses On' Smartphone App.

Android: https://play.google.com/store/apps/details?id=com.sixoversix.copyglass&hl=en_GB&gl=US

Apple: https://apps.apple.com/us/app/glasseson/id1153638659

Alternatively you can use the Fashion Eyewear 'Measure my PD' tool: https://pd-measurement.fittingbox.com/?apiKey=ovFmauNiLR1Mhh1BKLwD2hoapZKI_wNzVMzNjlx7GspVcR75SuIT8g - change to new Fitting Box

Please be aware that the vertical measurements for complex/varifocal prescriptions 

vary with every frame. It is especially important that these measurements are measured directly for the frames you intend to use. We recommend that you try your frames on in person and send us a photo so we can calculate this.