when making a pair of glasses, one of the most important measurements is the distance between pupils or PD. This measurement ensures that the centre of the lenses of the glasses corresponds with the centre of each pupil.
There are a few ways of measuring this, its actually quite simple.
You can measure it yourself simply by measuring with a ruler the distance between the centres of your pupils, like this:
Amazon sells a variety of different tools for measuring this, the one we recommend is this one:
If you would rather let us work it out for you, a good method is to send an image of yourself with a credit card just under your eyes. We can then use our software using the card for size reference to calculate your PD.