Pupillary distance and how to measure it

So, you have chosen the best blue light glasses for your needs and you want to have your script placed in your favourite frames. You upload your script but one piece of information you will need to measure yourself is your Pupillary Distance (PD)


What is PD?


Your PD is the distance between your pupils and its always measured in millimetres (mm). Your pupils are the black circles located within the coloured part of your eye. The PD lines up the centre of your eyes with the centre of your lenses.


Without having an accurate PD reading it could cause your prescription glasses to cause you to feel sick, have blurred vision or get headaches.


The easiest way to get your PD reading is to simply ask your optometrist. They often leave it off the script they give you to prevent you from buying your blue light glasses online. However, if you cannot obtain your PD reading from your optometrist then it’s easy to measure it accurately yourself.


Measuring your Pupillary Distance


  • Stand 8 inches away from a mirror
  • Grab a ruler and hold it straight against your brow
  • Align the 0 mm of the ruler with the centre of your left pupil. Do this by closing your right eye
  • Look straight ahead, then close your left eye, but open the right one
  • The line of the ruler that’s lined up with the centre of your right pupil is your PD



If you have any questions when measuring your pupillary distance, you can always reach out directly to our Customer Experience Team at contact@blublox.com


Related Articles

One thought on “Pupillary distance and how to measure it

  1. avatar Jennifer Song says:


Leave a Reply

Your email address will not be published. Required fields are marked *