Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!sun!imagen!atari!portal!cup.portal.com!LadyHawke
From: LadyHawke@cup.portal.com (Classic - Concepts)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <14496@cup.portal.com>
Date: 10 Feb 89 05:18:16 GMT
References: <6382@thorin.cs.unc.edu> <6511@cadnetix.COM>
Organization: The Portal System (TM)
Lines: 19

> I was supposed to see one number stand out in a row of numbers.

Be careful!!! This doesn't NECESSARILY mean you have no depth-perception.  I t
took a similar test in which one number was 
supposed to stand out in a row of numbers.  My 3d visualization and depth
perception are reported to be excellent but I flunked totally on that one.
You see, not all tests purported to measure depth-perception are actually
in 3d!  Some are illusions created with shape or colors or other cues we
are familiar with.  The test you describe and the one I took may fall into
this category.  In my case what I saw was little green outlines to one side
of each letter.  Now, to someone with normal or '20/20' vision, perhaps
one looks closer due to the illusion, but to me (I have way above average
vision; it was 20/13 and 20/15 at the time of the test) all I saw was little
fine lines around the letters.  None appeared to be closer until the very
last one when I blurred my vision out of sheer nervousness and frustration
and voila! one of the letters popped forward!  But only if I squinted or
severely blurred the images.  I almost didn't get my driver's license based on
 that.  Consequently I wouldn't trust some of those tests, particularly if
they are ones based on the illustion of 3d.