Pupillary Distance (PD) is the distance between the centre of one pupil (the black opening in the middle of your eye) to the centre of the other pupil. You can ask your eye-care professional to include this measurement in your prescription but in most cases they might not provide it even though it is a necessary element in getting your glasses made correctly.
Here’s a simple and easy way of getting this done without any hassle – all you need is a ruler and either a mirror or a friend to help.
Place the ruler against your brow or just below your eyes – depending on where you find it more comfortable and easier to read the ruler.#
Make sure the ‘0’ marking on the ruler is aligned with the centre of your right pupil.
Measure the distance, in millimeters (mm), between the ‘0’ marking and the middle of the left pupil.
That’s it ! You have your own PD measurement. You can get a friend to check the result as well.