P3D Re: Imax 3D

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 3:54 AM -0000 6/3/98, Paul Talbot wrote:
[deleted]
>
>I did not experience any significant eyestrain viewing the film,
>but it was definitely a workout for the eye muscles, switching
>between viewing objects appearing almost in your lap, and objects
>at the screen.  This makes me wonder about someone's recent comment
>that sitting at the back is easier on the eyes.  With the stretch
>effect, the objects at the lap of a viewer in the first row will
>also appear to be at the lap of the viewer in the last row, will
>they not?  So the viewers closer to the screen have much less
>changing of accommodation (?) to do, as best as I can figure it.
>

"Accomodation" refers to the distance at which the eyes are focused, which
is always the same.  The difference between the front & back would be in
the amount of "vergence" required, i.e. converging & diverging the eyes, &
in the extent of the mis-match between accomodation & vergence.

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
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