Meaning of "damage" (was Re: Window reversal)

[P3D Paul Talbot <ptww@xxxxxxxxx>]

> >>There is truth in this analogy (music); however, no matter what
> >>dissonances one uses in composition, one can't damage the listener's
> >>ears, only offend their artistic sensibilities.  Unfortunately due
> >>to the nature of vision, a badly-mounted stereo *can* cause
> >>physical pain in the viewer.

This message introduced the concept of "damage" but then backed off
to "physical pain."

> Attempting stereo viewing of certain images can physically damage a
> certain percentage of the population. Some of the "rules" are designed
> to minimize that risk.

"Damage" as in to impair the physical attributes of the person?  Are
we talking about damage or discomfort?  If damage, permanent?  Long-
term?  Acute?  Are we talking something comparable to a pin prick, a
hornet sting, a sunburn, extensive 3rd degree burns, or an amputation?
This is the first I've seen the term "damage" used regarding viewing
photographs, but if "damage" is what is meant, it should be broadcast
load and clear.  Clarifications please?

Paul Talbot
sounds like something potentially 
 There are also recommended practices for people
> viewing images, to
> reduce the risk of this happening. So if you start experimenting with breaking
> the "rules" at random, I suggest you be careful when viewing the results.
> 
> John R


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