Instructions for 3D Visualization
Via Stereo Pairs
Most of you will be able to view the three dimensional aspects of
these stereo pair images by:
- Aligning your eyes in a parallel position, as they would be
aligned in looking at an object at a distance. Looking toward a
distant object might help at this step.
- Without changing the parallel alignment of your eyes, look at
the left image with your left eye and the right image with your
right eye. Three blurred images should be apparent.
- Without changing the parallel alignment of your eyes, focus
them on the left and right images. The center image should come
into focus and appear three dimensional, while the lateral images
will remain slightly out of focus. This is the hardest step in the
procedure, since our natural tendency is to converge our eyes when
focussing them at something near. With a little bit of practice,
most people can learn to overide this tendency and focus on the
images while maintaining parallel alignment of their eyes. If you
cross your eyes, a pseudoscopic image will form, in which depth
will appear inverted.
- NB. Some browsers may display these images at dimensions too
large to achieve a three dimensional image. If this is the case,
you should scale the images to ca. 15 cm in width.
- Some of you (about 15% of the human population) will be unable
to achieve a three dimensional image. Too bad for you. There's
nothing you can do about it, since it apparently is related to the
way in which your brain is wired.