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Re: Are HMD/eye displays harmful?

From: "Tristram W. Metcalfe III" <>
Date: Wed, 03 Mar 1999 20:11:15 -0500

Look in the early VR media, like old back issues of CyberEdge Journal, you'll find some of
the health problems (worst for developing +- 12 yr. old eyes = 'problems later'). Most
issues are in binocular modes, where one tricky issue rests (claimed by some as "no solution
'in sight'") that being the focal problems of accommodation & convergence disparity.

This is not a problem with monocular displays, and when not seeing far ahead to the 3D; VR
&or AR apps comming (= near sight!), then you've not a whole lot to worry about beyond
subjective optical eye strains + what else?

The disparity issue we see as our eye's focus on say 3 ft out, simultaneous with the
convergence of our 2 eyes not actually converging at 3 ft out, but instead on a 'wherever
else' singular image plane. This disparity eventually makes too many tired and sick.

A potential source of other good insights should be found in last years AreoSense conference
in the following Session ;

Human Factors Issues and Tests
Chair: Clarence E. Rash, U.S. Army Aeromedical Research Lab.
What is it in head-mounted displays (HMDs) that really make them all so
terrible? K. Keller, Univ. of North Carolina/ Chapel Hill [3362-05]

(anybody who's read it and has a summary to share would likely be appreciated on the list)

Tim Gray wrote:

> Ummm this sounds like one of those urban myths floating around.   I've
> played so many games of dactyl at the arcade, and used VR enough to have
> developed such problems and I have not. I also use my M-1 once in a while
> as the wearable is in pieces right now.  I would say unless you have a
> medical problem to begin with I doubt very much that using an HMD would
> hurt you...  Wouldn't every camcorder user or a large number of them end up
> with the same problem?
>
> I would say that this tidbit you were told might be a non-fact that has
> been floating around for a while on the net.
>
> ----------
> > From: Thomas Renard <>
> > To: 
> > Subject: Are HMD/eye displays harmful?
> > Date: Wednesday, March 03, 1999 12:46 PM
> >
> >
> > 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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.02
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