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RE: AR Sickness/Blink rate

From: "Tony Havelka" <>
Date: Thu, 7 Aug 2003 07:58:15 -0500

> I've had the dreams before from overindulgent Quake sessions, 
> didnt Steve Mann claim he felt ill when he had to remove his HMD
display for a 
> while?? Steve  you there LOL..

When you are involved in a traumatic event (eg.:car crash) it takes up
to 48 hours before the even begins to manifest itself in your
subconscious or dreams.  It take less than 24 hours for a virtual
reality event to begin to manifest itself in your subconscious.  This
was studied early on in the VR days as many people were noticing the
same phenomenon.  The car crash - while real, usually occurs
instantaneously and is perceived as almost unreal - "That didn't just
happen - did it?". On the other hand, Virtual Reality environments -
good ones - are designed to suspend belief very quickly and make you
believe you are actually there.   The line between reality and virtual
reality, at that point in time, is blurred - to your senses.  The
experience lasts longer than an instant and makes an impression on you
in many different levels.  Dreaming about Quake the night you played it
is very common - disturbing but common.

> Sometimes I've heard of dominant eye issues as well 
> especially on the design 
> of the Apache Helecopter monocular HMD
> the quake thing makes me feel ill thinking about it, (hope 
> that wasnt in work time John)

The eye dominance thing comes into account really on monocular systems.
In biocular systems (monitor) most of the issues come from not blinking
or not changing your field of focus enough times which causes the eye
strain.  In binocular systems (HMDs), focus, dipvergence and convergence
issues have been closely linked to eye strain as well.

-Tony

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