OT: can you see 3D with only one eye?

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Randy Brown wrote on 6/15/2010, 7:22 AM
I can tell you this from experience; by trying to test some of the theories posted here (looking through one eye and then the other testing depth perception etc) one can get a headache.
overyonder wrote on 6/15/2010, 7:56 AM

"Whether they were criminals or contractors - it depends on your perspective...."
"...a few went rogue and gave the whole industry a bad rep."

Yeah, if a government pays you to pillage and plunder, you're a "contractor" deserving of our respect. If you work for yourself, you're a "criminal", and besmirch the reputation of all good "contractors" around the world.

But back to the amazing stereo-vision brain of ours: In the 4th grade I remember looking at old B&W aerial photos in a book. You'd look at a pair of photos with a viewer that brought the two images together into a kind of 3-D. We didn't have the viewer available, but when I crossed my eyes the two images would overlap and then !Click! the images would fuse and I could look around the 3-d space without further eyeball effort. I remember being quite amazed.

Grazie wrote on 6/15/2010, 9:09 AM
Question here is - Can we see 3-D with 2 eyes? - And, BTW what is 3-D anyway? And again, what does an insect see with multiple receptors? Is our version of 3-D the same as an insects or an eagle or a dog? Does a dog have an awareness of depth of field?

Grazie
gpsmikey wrote on 6/15/2010, 10:50 AM
Good point on "what is the definition of 3D anyway". Looking at depth perception etc from a slightly different viewpoint, check out "forced perspective". We tend to think of 3D as depth perception, but it can also be viewed as different planes moving relative to each other giving the impression of depth that may not be valid. I think I am getting a headache !! http://en.wikipedia.org/wiki/Forced_perspective

mikey
Serena wrote on 6/15/2010, 4:13 PM
>>>Does a dog have an awareness of depth of field<<<

Generally predators have forward facing eyes to give them precise knowledge of the prey's range (e.g. owls, cats, dogs, eagles). Prey have wide field to detect threats, so the FOV of each eye may have only small overlap. Several species have highly mobile eyes (e.g. gecko) so they can move their eyes independently (surveillance) or in coordination (attack). Spiders have both forward facing eyes and extra surveillance eyes. Insects probably only require surveillance, although predator insects (e.g. praying mantis) appear to have depth perception (they may also rock prior to striking). The functional basis of depth perception is to estimate range and velocity vector. What various critters would make of 3D TV is unknown, and until recently it was said that cats and dogs were unable to interpret 2D images (e.g TV).
fldave wrote on 6/15/2010, 7:05 PM
Without reading the above answers. the answer is "No".

3D requires two separate inputs to the brain.

I had a brain injury/stroke which destroyed my 3D vision centers. 5 months of vision rehab/3D exercises, my brain created new paths to those sensors.

What happens in many people is that damage occurs in one eye and it is not caught for many years. Spacial problems, reading issues, eye-hand coordination problems can arise. Dyslexia is suspected also.

After 5 months of therapy, I functioned normally, well 95% normally, and more normal than a lot of people I know, LOL.

Avatar was the first movie that applied the 3D subtly, and that I had no issues watching.

The Doc who fixed me says that hand-held games are one of the worst culprits in the spread of vision issues. Kids use to play with hand-held toys using their 3D skills constantly. Now they watch a flat screen 2 ft from their face and are now having issues.