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Post By
Omar Karindu

Member Since: Sat May 17, 2008
Posts: 4,242
In Reply To
Reverend Meteor

Subj: Re: The reason...
Posted: Wed Jan 13, 2010 at 11:34:48 pm EST (Viewed 780 times)
Reply Subj: Re: The reason...
Posted: Wed Jan 13, 2010 at 07:05:36 pm EST (Viewed 9 times)

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    we get to see in 3d is because we have 2 eyes providing 2 different perspective(images) of something that our brain recombine into one image. Stereoscopic vision requires more than one image that you can't have with just one eye... sorry man.


Why do I find myself wondering how a being with 3 eyes would perceive 3-D.

I suspect that a third eye doesn't significantly improve depth perception when compared to the biological costs; three eyes placed closely enough together to use up only one synthesized visual perspective in the brain isn't that much better than two for 3-D vision. Diminishing returns on additional eyes set in fairly quickly if you assume the perceiving brain is like ours in the way of synthesizing all the angles into a "unified" visual field.

After all, most creatures with more than two eyes either use very simple eye structures to produce simple, but wide-ranged visual perspectives and thus avoid having overly complex nervous systems, and the only fairly complex animal with three "eyes" is the tuatara, whose third organ is more of a heat sensor with its own visual pathway. Its closer relatives among the reptiles, seem to have either dumped that entirely or gone with a heat-detecting organ that really isn't quite an "eye" in any but the most technical of senses. Natural selection would seem to have ruled out any greatly significant advantages of three eyes.

- Omar Karindu
"For your information, I don't have an ego. My Facebook photo is a landscape."
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