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Are HMD/eye displays harmful? (fwd)

From: "Robin Burgener" <>
Date: Wed, 3 Mar 1999 22:42:57 -0500 (EST)

I have experimented with binoccular HMDs.  The worst problems
I found were from focusing at a fixed distance while looking
at objects at different distances.  This was causing me and
a few other people something similar to motion sickness.  The
focal length of your eyes is telling your brain that the objects
are 6ft away while the convergence is saying something else. 
I also had trouble focusing after removing the HMD.  The 
manufacturer recomends not using the device for more then
15 minutes at a time.  They also recommended a minimum age for
using the display since young brains and eyes could permanently 
adapt to the HMD.

If the display could incorporate some sort of variable focus, the
whole problem could be avoided.  I have had some thoughts on this
but I do not have the facilities to build the hardware.  The basic
premis is a projection technology that utilized focal length as 
part of the video stream (R,G,B,F).

> 
> Hello,
> 
> a friend of mine told me, that some german computer magazine tested
> HMDs for games. They said that most of the people who tested the HMDs
> have problems with their eyes now.
> 
> Ok, I heard about the simulation-syndrome some years ago but this
> thing is something with the eyes (changing of lenses or so)
> 
> Any suggestions? What about one eye applications? Do you harm your
> dominant eye if you use your display every day? What about the passive
> none dominant eye? 
> 
> If so - what are the alternatives of HMD to display graphics with
> wearables outside?
> 
> Thomas
> 

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