How you can measure your IPD for VR headsets and why it is essential

How you can measure your IPD for VR headsets and why it is essential

IPD stands for interpupillary distance, which merely means the gap between the middle of your eyes. It is essential to know your IPD in relation to VR and AR headsets as a result of headsets may be adjusted to match your IPD for one of the best picture high quality and luxury. Understanding your IPD is essential to understanding which headphones are greatest suited on your eyes. Fortuitously, you possibly can measure your IPD simply and routinely if in case you have a latest iPhone or iPad Professional, or use one in every of a number of easy measurement strategies.

EyeMeasure is a free iOS app that makes use of the TrueDepth digital camera discovered within the newest iPhone and iPad Professional fashions to measure your IPD. Developer Dotty Digital claims that the measurement is correct to inside 0.5mm. As soon as you employ the app, the “distant” IPD measurement is the one you will use when configuring your headset.

You should utilize the app to measure your IPD utilizing the next iOS units:


  • iPad Professional 12.9-inch (third, 4th, fifth, sixth era)
  • iPad Professional 11-inch (1st, 2nd, third, 4th era)

If you do not know which pill you are utilizing, discover ways to determine your iPad mannequin.

Different methods to measure your IPD

Picture courtesy Will Folsom (CC BY 2.0)

If you do not have entry to one of many above units for automated measurement, listed below are different methods you possibly can measure your IPD distance.

On-line IPD Measurement Device (Best)

You’ll be able to measure your IPD utilizing a browser-based instrument like this one. This may work by your browser in your pc or smartphone. You can be requested to take a photograph of your self holding any commonplace measurement magnetic stripe card (eg: bank card or driver’s license) which will likely be used to find out the right scale for measurement.

Ask your eye physician (most correct)

Essentially the most correct IPD measurement you will get is out of your eye physician. If you happen to’ve been going to 1 because you reached your grownup measurement, your physician ought to have an correct measurement on file; Name them and ask if they’ll present your IPD measurement in millimeters. If you happen to’re beneath 20 and it has been greater than a 12 months since you have seen your eye physician, it’s possible you’ll need to have a checkup to be sure you obtained a latest measurement.

Use a mirror (correct however you want a ruler)

Utilizing a ruler and a mirror, you possibly can simply measure your IPD. Our buddy Oliver Krylos offers these easy directions, in addition to extra detailed particulars.

  1. Stand in entrance of a mirror and convey the ruler as much as your nostril, in order that the measuring edge extends straight under your pupils.
  2. Shut your proper eye and look straight into your left eye. Transfer the ruler in order that the “0” mark seems straight under the center of your left pupil. Attempt to hold the ruler regular for the following step.
  3. Shut your left eye and look straight into your proper eye. The mark just under the middle of your proper pupil is the interpupillary distance.
Ask a buddy (however you want a ruler… and a buddy)

Are you a vampire and do not have mirrors in your home? Ask a buddy with a gentle hand to carry the ruler straight beneath your eyes. Look straight forward at a distant object and ask your buddy to align the “0” mark with the middle of one in every of your pupils after which learn the measurement under the middle of your different pupil. This measurement is your IPD.

That is additionally a really perfect technique to rapidly measure the IPD of a VR beginner to whom you’re demonstrating VR.

Eyeball (when in hassle)

This feature often is the most error-prone, nevertheless it’s in all probability higher than nothing when you simply want a fast and soiled alignment; It solely works with headphones which have precise IPD adjustment.

Whereas contained in the headset, flip off your gadget Non-dominant eye. Together with your dominant eye open, take a look at a pointy, recognizable texture similar to textual content or the flat fringe of an object. Begin adjusting the IPD setting forwards and backwards to slowly discover the place of most sharpness. This could put you within the ballpark of your superb IPD setting. we’ll no We suggest making an attempt this train with each eyes open as a result of it’s simpler to misalign the IPD when utilizing each eyes.

Due to Alan Hambrick who shared this technique within the feedback!

Why setting IPD appropriately is essential in a VR or AR headset

Picture courtesy of Dboybaker (CC BY 2.0)

Tricking our brains into pondering we’re seeing one other actuality begins by feeding our eyes pictures that carefully match how we understand the actual world. This implies ensuring the pictures are aligned appropriately with every eye, identical to adjusting the view on a pair of binoculars.

Since we all the time see the actual world from the attitude of our IPD, right alignment within the headset is essential to match our inherent sense of 3D depth and quantity. In case your headset’s IPD is about incorrectly, the amount of the digital world will sound considerably incorrect.

Even when a selected headphone would not have bodily IPD adjustment, most headphones have IPD adjustment software program that may right the sense of quantity. Both manner, you will must know your IPD measurement to set this appropriately.

Setting the right IPD can also be crucial to maximise picture high quality in VR and AR headsets.

Most headsets have lenses and shows designed to maximise readability and subject of view when seen by the “optical middle” of the lens (that is additionally referred to as the “candy spot” or “eye field”). If the middle of your eyes doesn’t line up with the optical middle of the lenses, you’ll not get most readability and subject of view; Relying on the lens, this misalignment can result in a sudden lower in imaginative and prescient high quality.

Fortuitously, many headsets have bodily IPD changes that mean you can change the gap between the lenses to align your eyes with the optical middle of the lenses. All main headphones with dials or sliders to truly regulate the IPD have a digital readout in millimeters displayed contained in the headset that you should use to match your IPD.

Briefly, figuring out your IPD and setting it appropriately is essential for reaching one of the best visible expertise and luxury in any headphone. If the measured IPD is an outlier, it is best to be sure that the headphone you select can accommodate your IPD; A headphone with bodily IPD adjustment will help a a lot wider vary of IPD measurements.

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