If the IPD of your headset is incorrectly set, the scale of the virtual world will appear to be slightly incorrect.Įven if a given headset doesn’t have a physical IPD adjustment, most headsets have a software IPD adjustment which can correct the sense of scale. Since we always see the real world from the perspective of or own IPD, correct alignment in a headset is important for matching our ingrained sense of 3D depth and scale. That means making sure the images are correctly aligned with each eye, just like adjusting the width on a pair of binoculars. Tricking our brains into believing we’re seeing another reality starts by feeding our eyes imagery which closely matches how we perceive the real world. Thanks to Allan Hambrick who shared this method in the comments! Why Correctly Setting Your IPD is Important in a VR or AR Headset Image courtesy Dboybaker ( CC BY 2.0) We would not recommend trying this exercise with both eyes open because it’s easier to misalign your IPD when using both eyes. This should get you in the ballpark of your ideal IPD setting. Begin adjusting the IPD setting back and forth to slowly find the position of maximum sharpness. With your dominant eye open, look at a sharp recognizable texture like text or the flat edge of an object. While inside the headset, close your non-dominant eye. This option may be the most error prone, but it’s probably better than nothing if you just need a quick and dirty alignment it only works with headsets that have a physical IPD adjustment. This is also an ideal way to measure the IPD of a VR novice to which you’re demoing VR. Look straight forward at a distant object and ask your friend to align the “0” mark with the center of one pupil and then read the measurement under the center of your other pupil. The mark directly underneath the center of your right pupil is your inter-pupillary distance.Īsk a Friend (but you need a ruler… and a friend)Īre you a vampire with no need for mirrors in your home? Ask a friend with a steady hand to hold a ruler directly under your eyes. Close your left eye and look directly at your right eye.Try to keep the ruler still for the next step. Move the ruler such that the “0” mark appears directly underneath the center of your left pupil. Close your right eye and look directly at your left eye.Stand in front of a mirror and hold a ruler up to your nose, such that the measuring edge runs directly underneath both your pupils.Our friend Oliver Kreylos offers these simple instructions, along with a more detailed breakdown. With a ruler and a mirror you can easily measure your IPD. Use a Mirror (accurate but you need a ruler)
Pupil size chart to scale drivers#
You’ll be asked to upload a photo of yourself holding any standard-sized magnetic strip card (ie: credit card or drivers license) which will be used to establish the correct scale for the measurement. This will work through your browser on your computer or smartphone. You can measure your IPD with a browser-based tool like this one from Ace & Tate. If you’re younger than 20 and it’s been more than a year since you saw the eye-doctor, you may want to get a check-up to make sure you have an up-to-date measurement. If you’ve been to one since you’ve reached your adult size, your doctor should have an accurate measurement on file give them a call and ask if they can provide your IPD measurement in millimeters. The most accurate IPD measurement you’ll be able to get is from an eye-doctor. If you don’t have access to one of the above devices for an automatic measurement, here’s other ways you can measure your IPD.
Other Ways to Measure Your IPD Image courtesy Will Folsom ( CC BY 2.0)
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