To purchase your prescription glasses through eyewearthese.com we will require your pupillary distance (PD) measurement if your prescription is stronger than +3.00 or -3.00 for either eye.
If your prescription is below +3.00 or -3.00 you can use an average measurement, for men this is 63, for women, this is 60.
We do however recommend obtaining an accurate Pupil Distance measurement as this ensures the lenses we produce are to the highest standard possible.
What is my pupillary distance (or PD)?
Your pupillary distance (PD) is the distance between your eyes. The measurement is taken between the centre of the pupils (black circles in the centre of your eyes) and is measured in millimeters (mm).
WHY DO I NEED MY PD MEASUREMENT?
It is important to ensure the centre of each eye matches the centre of each prescription made lens, this will ensure the correct alignment for your line of vision. Without an accurate PD measurement your eyes may become strained or you may feel discomfort, this is especially true where a prescription is stronger than +3.00 or -3.00 for either eye or varifocal lens is required.
WHAT DOES MY PD MEASUREMENT LOOK LIKE ON MY PRESCRIPTION?
There are two ways a PD measurement can be displayed, the first (and most common) is called binocular which is a pupil-to-pupil measurement and will measure between 41-80mm (the average for adults being between 54-68, and the average for children between 41-55mm) and looks like this: P.D.:62
The second measurement is called monocular which is a per-eye measurement taken from the centre of the eye to the centre of your face. A monocular measurement is used when the face is not in equal proportion and is unbalanced, this means the distance from the centre of the face to each eye is different and looks like this: P.D.: 30.5 / 30
The PD can be written on your prescription in a couple of different ways, we illustrate the most common below and how to enter these correctly when ordering on our website.
|PD written as:||PD measurement:||Lens type:||Enter on website as:|
|P.D.: 62||Binocular PD measurement for both eyes (OU)||Single-Vision|
|P.D.: 30.5 / 30||Monocular PD for both eyes. The left number is the left eye (OS) and the right number is the right eye (OD)||Single-Vision|
|Near/Reading and Far/Distance Binocular PD measurements for both eyes (OU).||Progressive / Bi-focal|
My PD measurement is not on my prescription, help!
Usually your PD is taken during your eye examination but often not written on your prescription form, if this is the case you can ask your optician for your PD measurement.
Alternatively you can use:
- Our printable PD ruler, you just need access to a printer and mirror and you can measure your own PD. You can download this form by clicking Printable P.D ruler and printing off the form. The form has a step-by-step on how to measure your P.D.
- Purchase an application on your smartphone, simply search for ‘Pupil Meter’ and any of these apps this will give an accurate reading of your PD which you can then share with us.
If all else fails we can use an average PD measurement, this will not harm the eyes but may cause discomfort or strain if your PD varies greatly from the national average .