Parallel viewing requires that
the left image is placed on the left-hand pane and the right is on the
right-hand pane.
Some people can look wide-eyed directly at the screen and fuse a
stereo pair into a single image that has depth. Images should
be sized to about 3 inches for presentation
without inducing serious eyestrain. An inexpensive pair of prismatic magnifiers (right), which can be obtained
for a couple dollars at Reel3D
company (Item No 2018), may help considerably with this method
of viewing.
Move your head forward and back, and adjust the glasses out away
from your face until the image fuses. Center your face between the
image pair, and try approaching in from a fair distance (like 18
inches). If you are too close it gets more difficult to merge the pair.
More sophisticated devices exist for looking at parallel images on
your monitor. These instruments include the Pokescope
and the ScreenScope.
Crosseyed pairs are formatted such that the left image is on the
right-hand pane and the right is on the left-hand pane.
Not everyone can lock in stereo pairs with this method.
Put your finger about 6 inches in front of your face and focus on
the tip.
This forces your eyes into a cross-eyed mode.
Now try and merge the pictures that are in the background.
Draw them into the foreground and lock them in.
This is not an easy deal, and long periods of trying can produce
serious strain.
If you can’t do it, try one of the other methods.
For comfort in parallel and cross-eyed viewing, each image should be
roughly 3 inches on a side. Therefore if you have a screen running 1280 x
1024, a 3” x 3” image will contain more information than an 800 x
600 screen, for example. For maximum detail, then, use your
highest screen resolution.
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