Some opticians have been known to charge a fee for this very basic measurement.
If you can use a ruler, your'e already halfway there.
Pupillary distance (PD) is the length, in mm, between the centre of your pupils. This measurement determines where the centre of your lenses are, according to your eyes.Via your biennial eye exam, your prescription doesn't always state your PD.
On this occasion, the following steps will show you how to measure it yourself and why you certainly shouldn't be charged for it.
Grab a friend and the nearest ruler.
Instruct them to carefully hold the ruler across your brow.
Using mm, your assistant can simply measure between your pupils.
Note your PD on your phone or write it on your prescription paper.
Stand about a foot away from a mirror.
Hold the ruler across your brow.
Close your right eye then align the ruler’s 0 mm with the center of your left pupil.
Look ahead then close your left eye and open your right eye.
The mm line that lines up to the center of your right pupil is your PD.
If you require single vision lenses, you’ll only need the total distance between your pupils.
For adults, this number will be in the region of about 60mm in total.
If you require multi-focal lenses such as progressives, bifocals and trifocals, you will require what is called your Mono PD.
This is the distance from the centre of your face to each individual pupil.
These number can be different such as 32.5mm and 33mm.