How To Measure your PD
To order glasses from Direct Sight it is important to have your Pupillary Distance or PD Value. If your PD value is not listed on your prescription, don't worry, this page will tell you how you can measure it yourself.
WHAT IS PD (Pupillary Distance)
Your PD value is the distance in mm between the centre of one pupil to the centre of the other. Having the correct PD value ensures that the centre of each lens sits directly over each of your pupils. This is especially important for people who have high powered prescriptions.
Download & Print
Print our downloadable PD Ruler at a scale of 100% on A4 paper. Double check that the measurements are correct by checking the ruler against a standard mm ruler and the credit card length. Then fold along the dotted line.
- If you are measuring yourself, stand approximately 20cm away from a mirror and use the side of the ruler marked as ‘Using a mirror’ place the page against your forehead. If a friend is measuring for you, you need to look straight head around 3m away. They will need to use the side of the ruler that is marked ‘Using a friend’.
Line up 0 on the ruler with the centre of your right pupil. Closing your left eye will help ensure that the ruler is lined up perfectly with your right pupil. Look straight ahead and measure the distance between your right and left pupils.
Repeat this several times to ensure that you have accurately measured your PD, use an average for your final measurement.