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*Last Updated: December 2021

The 5 Best Pupilometers [Ranked]

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A pupilometer or pd meter is designed to accurately measure pupillary distance.

Most commonly it is utilized for eyeglass-fitting to ensure that the eyeglass lenses are properly centered on the visual axis.

Some Confusion?

A confusion regarding pupilometers is that they refer to two different types of tools, one that will measure the distance between pupils, and the other that will test your pupils responsiveness.

We'll be examining pupillary distance pupilometers (Source).

A distance pupilometer works by assessing the distance between your nose bridge, where a pair of common eyeglasses typically sit, and your pupils' centers.

If you do not use a distance pupilometer to gather this measurement it's likely that the eyeglasses you or your customer ends up with will be a poor fit and even cause you some physical discomfort.

Most people who end up with incorrect eyeglasses complain of headaches and eyestrain- and you don't want that!

Let's take a look at 5 of the best-selling distance pupilometers on the market today.​

 Comparing The Options

Bestseller No. 1
Huanyu Digital Pupilometer 45-82mm PD Meter Pupil Distance Meter 0.1-0.5mm Accuracy Adjustable 30s-3min Automatic Shutdown Setting 30cm-+∞ Distance Setting Optical Instrument CE Approved (LY-9AT)
  • 【RECOMMEND LY-9AT】 This digital interpupillary distance meter features direct point-sampling and high accuracy of orientation. Compared to LY-9C, this one is more accurate in measuring monocular pupillary distance and has three self-setting functions The design principle is more advanced and reliable, which is our original patented model! No imitations!
Bestseller No. 2
Huanyu Optical Digital Pupilometer 45-82mm Pupil meter PD Meter Pupil Distance Meter Optical Instrument CE Approved (LY-9AT)
  • ◆ 【ACCURACY MEASURE PUPILLARY】PD Meter is a precision optical instrument used to measure distance between pupils in the process of optometry for spectacles,It features direct point-sampling and high accuracy of orientation.
Bestseller No. 3
Pupilometer,Digital PD Meter, Optical PD Ruler,Pupil distance measuring tool,Pupilometer with LCD Display (Gray)
  • 3 LCD Screen: there are 3 LCD Screen, monocular for left,right and binocular screen, it will be easy to read the PD value
Bestseller No. 4
Hanchen PD Meter Digital Pupil Distance Meter PD Ruler Pupilometer with Memory Function CE Certificate
  • 【Operation】It is recommended to have a second person help you while testing. Put the PD Meter over your nose, as close to your eyes as possible. Then find the center of your pupils, the white line should be aligned with the center. The number displayed on the LCD screen is your pupil distance(Unit:mm). Please keep your eyes looking straight ahead or at the nose of your tester during the measurement.
Bestseller No. 5
FULYEE Optical Digital Pupilometer Pd Meters LCD Display Optical Pd Meter Digital Pupilometer Pupillary Distance 45-82mm Pupil Meter
  • ACCURACY MEASURE PUPILLARY: PD Meter is a precision optical instrument used to measure distance between pupils in the process of optometry for spectacles. It features direct point-sampling and high accuracy of orientation.



Ease of Use

The Sunwin Digital Pupilometer has a binocular pupillary distance of between 45 and 82 mm, a left or right distance between 22.5 and 41 mm, and absolute value of indicated error of less than .5 mm.

Users were for the most part impressed by its accuracy, relatively low cost, and solid build. While the instruction manual appears to have been run through Google translate and the pupil alignment light could be brighter, most users were able to get up and running pretty quickly.


  • Solid build
  • Accurate measurement Reasonably price
  • Digitally stores readings


  • Poor instruction manual
  • Pupil alignment light could be brighter

How to measure pupillary distance

An optometrist will sometimes use a ruler to gather the millimeter pupillary distance measurement and then verify that measurement with the actual pupilometer device itself.

If you are looking to conduct an assessment using a pupilometer, the first thing you need to do is place it on your customer's face, atop the nose bridge, and instruct them to hold onto it as if it were a pair of common binoculars (Source).

You will then adjust the distance wheel to infinity.

What comes next, is that you will look through your end of the pupilometer and gather the distance measurement from the center of the pupil.

You will likely have to repeat this measurement couple of times until you're sure that you've gotten an accurate reading.

Interestingly, there are some smartphone apps that are equipped to measure pupillary distances. These apps will require that your smartphone have a camera as well as magnetic strip on a credit card to help provide accurate results.

Over at some optometrists have had a rousing discussion concerning the best method of calibrating and gathering an accurate measurement from their tools.

One confused optometrist rights that he has no idea what the numbers on the rotating knob are used for. One forum member responded that the numbers correspond to the distance patient eyes are aimed at. So, for example when it is set to 40 cm that is the distance that the patient's eyes are aimed at. 

Home pupilometer use

The pupillary distance is the distance (in millimeters) between your pupils' centers. You'll need this specific measurement when purchasing eyeglasses. When you visit the eye doctor, they provide you with your prescription however the optometrist typically does not provide your pupillary distance. This happens because the optician that sells glasses measures your pupillary distance when you purchase glasses.

When your skeletal system is full-grown, at approximately age 20, your pupillary distance doesn't alter with age. Kid's pupillary distance, or PD, alters as they develop. If you wish to purchase eyeglasses on the internet and help save a lot of cash, and if you're uncertain regarding your PD measurement, buying one to make use of even once could save you money.

For those who have an expanding family, this gadget could save you a lot of cash over time. For example, one user writers that purchasing glasses online now costs about $40 as opposed to $275 at the common glasses stores, as a result of knowing his PD to go together with his prescription.

Remember that your near vision PD is generally 2mm to 5mm smaller simply because you somewhat cross your eyes when looking up close (Source).

Some Old Favorites

These are some of our previous top picks- check out our comparison table at the top of the page for our up-to-date selections.

The Sunwin Digital Pd Meter$$9.8 x 5.9 x 3.9 inches1.6 Ibs
The Gizmo Supply Optical Digital PD Meter Pupilometer$N/A0.5 Ibs
The Gizmo Supply Optical Digital Pupilometer PD Meter$$3.7 x 11.8 x 8.6 inches2 Ibs
The Gizmo Supply Digital LCD Optical Pupilometer (CE Approved)$$$9.4 x 13.7 x 4.1 inches2.1 Ibs
The Sunwin Digital Pd Meter & Optical Pupil Meter$$9.8 x 5.9 x 3.9 inches1.8 Ibs

Final thoughts

If you are looking to purchase a pupilometer, reference our comparison table above make sure you are familiar with the warranty information of the particular unit you are interested in purchasing.

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