The Light Field Streoscope - ACM SIGGRAPH 2015

URL: http://www.computationalimaging.org/publications/the-light-field-stereoscope/

http://www.technologyreview.com/news/538976/how-to-stop-virtual-reality-from-making-you-want-to-puke/

Virtual reality is on the verge of commercial availability, with consumer-geared headsets like the Oculus Rift poised for release next year. Yet while the technology has improved immensely in the last couple years, there are still plenty of crucial issues to be sorted : motion sickness that some people have when experiencing virtual reality, which arises from what’s known as vergence-accommodation conflict.

Let's take a look at this picture.

when you’re looking at something—a flower, for instance—your eyes move and the lens in each eye adjusts to bring whatever’s in front of you into focus. Then, the vergence distance which is related to our brain cognition has same length with Focal distance. However, In the 3d display, usually lit-up display, our brain still realizes the object placed somewhere over the screen while our eyes see the display screen, and it is nearer than the vergence distance. It can result in nausea and dizziness. 

Researchers at Stanford are trying to solve with the headset, which they call a light field stereoscope, a device that uses a stack of two LEDs to show each eye a “light field” that makes virtual images look more natural than they typically do. 

This equipment shows us two different images for us, and our brain combines those images. You can get more details at the URL that I presented at the start of this post.