So, first thing’s first: what is pupillary distance (PD)? 

Essentially, it’s the distance between the centres of your pupils (the black bits in the middle of the eyes).

Your PD is an important part of your glasses prescription that makes sure you’re looking through the best spot in your lenses for clear vision. We’ll need this measurement if you’re buying your specs online.

Measuring your own PD

If you’d rather measure your PD yourself, or get a friend to help you out, have a look through our step-by-step guides.

Stand about 30cm away from a mirror

Looking at yourself, hold a ruler up against your eyebrows

Close your right eye, then line up the ruler so that 0mm is in line with the middle of your left pupil   

Look straight ahead again and then open your right eye and close your left

Your pupillary distance measurement will be the figure that lines up with the centre of your right pupil

For distance vision

Repeat these steps a few more times to make sure the measurement you get is consistent and accurate.

For an adult, you’ll be looking for a PD measurement between 54-74mm.

For reading glasses

We’ll adjust your PD measurement for your reading glasses for you.