Distance between waveguide and eye?

james_ashley

Just curious. How far is each waveguide from the user's cornea?

ChimeraScorn

This will vary depending on both the user and how they like to fit the device. The HoloLens can actually slide forward and back a bit in order to accommodate things like glasses (which can be worn comfortably under the device. This movement significantly changes the distance from the eye to the waveguide. Likewise, people's heads, and eyes are all slightly different shapes, so no matter how you slice it, there isn't one right answer to this.

ssylvan

Hmm, try this.. https://dev.windows.com/en-us/holographic/hologram_stability

ChimeraScorn

This will vary depending on both the user and how they like to fit the device. The HoloLens can actually slide forward and back a bit in order to accommodate things like glasses (which can be worn comfortably under the device. This movement significantly changes the distance from the eye to the waveguide. Likewise, people's heads, and eyes are all slightly different shapes, so no matter how you slice it, there isn't one right answer to this.

james_ashley

@ChimeraScorn ,

Thanks for the explanation. I was curious how you measure radiants, then, since the number of light points in a radian would seem to depend on the actual distance between the eye and the display (greater distance, lower density). Does the light point density measurement use an ideal distance?

ssylvan

While the physical distance to the wave guide varies, optically the virtual image appears at 2m. A couple of cm of variation in the physical distance to the wave guide glass therefore doesn't make a huge difference.

See the section 'Render distances' towards the bottom here: https://holodocswiki.com/wiki/Hologram_stability

james_ashley

@ssylvan said:
While the physical distance to the wave guide varies, optically the virtual image appears at 2m. A couple of cm of variation in the physical distance to the wave guide glass therefore doesn't make a huge difference.

See the section 'Render distances' towards the bottom here: https://holodocswiki.com/wiki/Hologram_stability

Thanks ssylvan,

The Holodocswiki appears to be behind a firewall.

ssylvan

Hmm, try this.. https://dev.windows.com/en-us/holographic/hologram_stability

ChimeraScorn

Sorry for the internal link having been posted. Internally we use a Wiki so that the entire team can contribute easily to documentation. We publish the contents of the Wiki to the public documentation several times a day. If there is a link (inadvertently) published which references the internal server, you can always find that same content on the public server at .. https://dev.windows.com/en-us/holographic/