Re: how to shift your eyeballs outwards.

[P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

>Date: Sat, 11 May 1996 16:11:25 -0500
>From: P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>
>Subject: Re: how to shift your eyeballs outwards.

>A lot easier for some people than others, unfortunately.  The
>linkage between accomodation (the distance the eye is focused
>at) and convergence is calibrated differently in different
>people.  I'm an exophore, as you probably are also; my eyes have
>a natural tendency to converge at a greater distance than where
>they're focused, so wall-eyed viewing is easier for me, too.
>For many people the opposite is true, however, & at least among
>vision researchers folklore says that most people find it easier
>to view cross-eyed.

I can parallel-view (with some effort) images up to about 3" wide (Holmes
stereoscope format). Unfortunately, hardly anybody can parallel view images
much wider than that, no matter how far away they are. For parallel viewing
images on a TV or computer monitor, that means the images can only take up
a fraction of the width of the screen, which means they are relatively few
pixels across (and therefore very poor resolution).

I can cross-view much wider pictures (and so can many people), which makes
cross-mounting generally more satisfactory (higher resolution images, etc.)
for images on a computer display or television *that are meant to be viewed
without the aid of a viewer*. (Especially since users may have different 
screen sizes. I've come across some parallel-mount stereo views online that 
seem to assume a 14" or smaller screen.)

Of course if the big cross-mount pictures are there, it doesn't hurt to also
make some small parallel-mount versions available.

John R


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