I was interested in your recent reply to the person asking about
depth perception because my opthamalogist told me that I too lack
DP. I wonder if it is because I was cross-eyed in one eye as a
child and was operated on when I was about 4 to cosmetically
correct the problem.
As a result of all this, I would like to know if you think that
my past history is the reason why I can't see a darn thing when
I look at those 3-D pictures! It would seem that depth percep-
tion would be vital since we are told to look "through" the
picture to see the 3-D image. Everyone also tells me to try and
make my eyes cross and again it seems ironic since I was born
that way and had to get it corrected! I know that the 3-D
industry people say that ANYONE can see their works of art, but
I wonder if that is really true. What do you think? Thanks-
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Answered by Richard E. Gans, M. D. (xx102@ofcn.org)
Yes, it is because of your being cross-eyed as a child that you cannot see the 3D images. The concept at issue here is called "stereopsis", that is, stereoscopic vision. In order to have stereopsis, both eyes must work synchronously from birth. If the eyes are not perfectly aligned, the images seen by each eye are focused on differing areas of the retina. Even if the eyes are realigned surgically, stereopsis rarely develops in those who were born with crossed eyes.
It is not true that "anyone" can see the 3D effects of this art form. If it is any comfort to you, many of us with normal amounts of stereopsis still have trouble seeing some of these images.
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Copyright, 1995. Richard E. Gans, M.D.
A RICHARD E. GANS, M.D. 11
A A OFCN Primary Sysop, The Eye Clinic 111
AAAAA xx102@ofcn.org 11
A A A C A D E M Y O N E 1111
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