I was also helping a couple relatives who similarly wanted to order glasses online, and they didn’t have any information for the PD measurement on their prescriptions at all! So I needed a way to find the measurement. But I wasn’t quite sure what to enter, as I had gotten slightly conflicting numbers from different optometrists in the past. But besides entering in my vision prescription, I also needed to provide my Pupillary Distance (PD) measurement, which is the distance in millimeters between the centers of the pupils of your eyes. Last year, I was looking for a new pair of glasses, and I decided I’d try ordering glasses online. Read on from the top for the story behind the ruler:Ĭlick here to download the printable PD ruler (includes instructions) (PDF) Scroll to the bottom for usage disclaimer. However, if you’re cool with average, here’s the average PD’s for adult men and women.Scroll down for printing and usage instructions. You’re better taking a few minutes to get a proper measurement using our advice above. If you wear single vision glasses, it can be okay to use average PD’s. For example, your right eye Mono PD could be 32.5mm and your left eye could be 33mm. Your mono PD’s will vary ever so slightly. ![]() In fact, the most attractive celebrities have facial asymmetry… phew. You can measure your mono PD yourself with a basic ruler, but we suggest you use our free PD ruler which locates onto the centre of your nose for a more accurate result.ĭon’t worry, most people have a slightly asymmetrical head. Generally, total PD’s or average PD’s are considered as insufficient for varifocal prescriptions. Varifocal glasses have a higher tolerance of accuracy as they are a more complex lens type. This lets us that your lens centres are as accurate to the centre of your pupil as possible. However, if you require complex or strong prescription lenses such as varifocals, it’s imperitive that you provide your dual PD's as per each of your eyes. This is usually for single vision glasses wearers. These can be added together, but only if require a PD total. Your prescription paper may use dual PD’s as standard. Dual PD = the separate distances between the centre of your head and the centre of your pupils.Single PD = the total distance between the centre of your pupils.Mentioned earlier, your PD can be written as one or two numbers. ![]() What is single PD and dual PD when ordering glasses? Heck, with the instructions above, you know what you’re doing. Your glasses can sit ever slightly ‘off’ on your face so pin-point accuracy is perhaps a little bit overkill. Sure, you don’t want to give us the wrong pupillary distance… but think about it. It’s safe to say that guessing your PD is a big no no, especially after reading the steps we’ve shown you above.īut let’s not freak out about this one guys. To ensure that the centre of your lens aligns with the centre of your eye, your PD measurement is pretty important. Male or female, your PD size will vary, roughly between a minimum of 58mm and 68mm. If it’s stated as two separate numbers, they should be around 32mm.If it’s one number, it should be around 64mm or so.If your PD measurement is there, it’ll appear as one or two numbers. It might even be on the reverse-side of the paper. Take a good look at your prescription paper.Įxcusably, you might have overlooked your PD as it can sometimes be sneakily tucked away without realising it. Method 5: Your prescription may already have it Here’s a free pupillary distance app you can download. Measure the distance between the dots for your total PD.Get your partner to mark a small dot where your pupil is behind the lens.Grab your old glasses and a non-permanent marker pen.You’ll need help from a friend on this one so it’s good to ask nicely. Method 3: How to measure pupillary distance using old glasses The mm line that lines up to the centre of your right pupil is your total PD.Look ahead then close your left eye and open your right eye.Close your right eye then align the 0mm mark with the centre of your left pupil.Steady as you can, hold the ruler across your brow.However, it's pretty fiddly to hold the ruler still on your brow and will probably give you inaccurate results. Ok cowboy, you can use a regular ruler for this job. If you need varifocal lenses, you’ll need to take a more accurate measurement made of two mono PD’s.If you need single vision lenses, you’re safe to take the average measurement you get. ![]() You may end up with a couple of different measurements.
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