Are equal the two images we see in virtual reality?
Todays’ lecture is about introducing two important parameters that we need to take into account when buying a headset. We refer to the interpupillary distance (IPD) and parallax.
IPD is the distance between the center of your eyes’s pupils. Well, actually this is called real IPD. So as you may expect, this length should match the distance in between the center of the lenses of the head-mounted display. Otherwise, we could experience blurred vision or occasional double vision.
The average real IPD of humans is 64 millimiters, with a range of 54 and 72 milimiters.
On the other hand, we have the virtual IPD: the distance between the cameras. Developers play with this parameter to alter the sense of scale of virtual objects in relation to the viewer, increasing or decreasing the size of the virtual environment as desired. Look this happy user testing the difference of real and virtual IPDs.
Lastly, to obtain the stereoscopic effect, each eye must see an image a little bit different from the other one, as occurs in actual reality. In more technical words, there is a difference in the apparent object’s position viewed along two different lines of sight.
This is called parallax, and together with the virtual IPD, is the most relevant parameter to obtain a sense of real presence within the virtual world. Here is a very representative example.
Hopefully, you will make the next choice of VR headset with more conscience of what’s behind!
Thanks for taking the time to discuss this, I feel strongly about it and love learning more on this topic. If possible, as you gain expertise, would you mind updating your blog with more information? It is extremely helpful for me.
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