Colophon, I’ve never heard of a dominant eye. Both of them should work equally. It sounds to me like you have one that just doesn’t function very well. Have you seen an optomitrist about it? (“Not with my right eye!” rimshot)
If I focus on the picture, I see a finger on each side of it. If I focus on my finger, the concept of “in between” doesn’t really come up. But I’ll see the picture on either side of it.
I’m in a LIBRARY and the girl next to me is TALKING ON HER PHONE.
And NOBODY IS SAYING ANYTHING ABOUT IT.
I’m beginning to wonder if I’m in the Twilight Zone, and I’m the ignorant one.
ETA: I posted one of those complaint form things, asking “When will you guys enforce the rules? Is this not a college library? Do people not study here?”
The reply I got was “The computer area seems to be the noisiest. It’s quieter in the stacks.”
NO SHIT.
OK, but when you focus on the finger itself, they merge into a single image, right? So is it in the “left eye” position relative to the background, or the “right eye” position, or somewhere in-between?
ObWilfulIgnorance: Bart Sibrel. This guy has been spouting nonsense about the Apollo landings being a hoax for ages, and whenever one of his “proofs” is shown to be horseshit he changes the subject to a new one. To be honest I have my doubts that he actually believes the crap he spouts; I think he might just be doing it to annoy people (and to sell his books and videos of course).
I see my daily dose of willful ignorance by reading the comments to articles at AFA.net. The willingness of those those people to accept whatever is said by their religious leaders is truly frightening.
God. I remember getting kicked out of the college library for making too much noise. And we were only giggling a bit too much.
Both, as there are two backgrounds.
What’s astounding about this is that we see all of these double images all the time, and usually never notice. We disregard the illogical disinformation as not even existing.
This bit of ignorance can be blamed on the subject being young, but still – Sheesh:
I had just told him that I play the guitar.
“What kind of guitar?”
“Um, electric?”
“No, I mean do you play basic guitar?”
“What do you mean?”
“Basic guitar. Do you play basic guitar?”
“Oh, you mean bass guitar?”
“NO! BASIC GUITAR!”
“Um… I play lead and rhythm. That’s pretty much all there is.”
“BUT DO YOU PLAY BASIC GUITAR?!?”
“I have no idea what you’re talking about.”
“Huh. Then I guess you’re not very good.”
Everybody has a dominant eye. Look at something a reasonable distance away. Just look at it normally. I’m looking at a lightbulb right now. Hold out your two hands so your thumbs and index fingers make a triangle around it. Close one eye and then another. The eye that sees the lightbulb framed in your triangle is your dominant eye - the other one won’t line up right.
I’m another one of those people who, before LASIK, had eyes of such radically different power that I don’t really use my binocular vision. I never have seen a Magic Eye picture. I believe I mostly guess distance by relative size. I can, however, see 3D movies.
They merge into a single image at the “average” poimnt between the two ghostly images. Which means, I suppose, that neither eye predominates by a huge amount.
At the same timem, though, the background splits into two ghostly backgrounds. You can’t have everything.
Obviously he learned from this book. 
Re: my eyes… I have had them tested, regularly. The optometrist said what I pretty much know, my right eye is not much good, but with both eyes my vision is actually above average in most areas, but my depth perception is not as good as it could be. But to be honest it doesn’t affect me in any noticeable way, barring the occasional air shot on the squash court if the ball comes out of my right peripheral vision. Generally I play pretty well.
The mind boggles. Are you sure she wasn’t just messing with you? I mean, that’s some pretty impressive ignorance.
I have related here the story of my uncle’s wife who insisits that the pharmaceutical companies have a cure for cancer but won’t release it because, “they make too much money selling their other drugs and curing cancer would mean fewer profits from those other drugs.”
No amount of reason would convince her that there is no cancer “maintenance” drug.
No amount of reason would convince her that a company with a proven cure for cancer could name any price they wanted for the drug and people would flock to them regardless.
The only solution I found was to tell her that I found her argument lacking in logic and then go off and find another glass of wine. There is no reasoning with some people.
So THAT’S my problem…despite my being Black?! Damn that Jewishness! ::shakes fists::
(And in case **pool ** flys by: Hey, man, I didn’t mention gay this time!) 
I used to have a co-worker who believed that. He also believed that a cancer cure would never be developed, because there’s too much money in the treatment. He also believed that there was no such thing as cancer, it was just a scam invented by doctors. That’s right, he believed that doctors have a secret cure that doesn’t exist to a disease that also doesn’t exist.
How he believed all three of these things at the same time, I can’t even imagine.
… I actually think I know what he’s talking about.
When I was in pre-kindergarten I was watching a guy play classical guitar. To me, it looked like he was playing one string at a time.
When I saw my friend’s big brother strumming chords, I asked him some really naive, little kid questions about his fretting, and he dumbed down his answer and essentially told me “that’s the way you play several strings at once”.
I thought that sounded much more difficult. The first guy played one string at a time, and Stewart was playing all of them at once! I didn’t really label the concept, but I suppose if someone had asked me I probably would have said the visitor played “basic” and my friend’s brother played “fancy”. Or some other childish equivalent.
It’s also common ‘knowledge,’ especially in the Bible belt, that anal doesn’t count. that’s why it’s called everything BUT. I wish I were joking.
That. Is awesome.
Huh. Maybe I’m ambisightrous. If I try to line the object up in the triangle, I see two equally ghosted triangles. If I go for an average, then close one eye then the other, the object moves around in the triangle, and is never centered.
Maybe I’m a freak of nature? My sight is good, 20/20 in one eye and 20/15 in the other. (I should say that lately, fonts are getting smaller and smaller, though. Warnings on OTC drugs are pretty useless to me. And the other day I put on the reading glasses that I own but never use.)
This is a huge hijack of the thread, and might make a great GQ topic.
Close your eyes, don’t “think” about looking at anything, just spontaneously look in a natural way and put your triangle over what you see to start with. You don’t always just normally, when looking at things, see two of them, right?
I think that eye dominance is a matter of degree…your having good vision in both eyes probably accounts for the fact that you have good binocular vision, as well. My eyesight is 20/20 in one eye, around 20/200 (or probably worse, these days) in the other. My good eye is extremely dominant. When I was a kid, they put a patch over my good eye to help my lazy eye work better, but it didn’t help.
I was just thinking that, too.
I believe a small percentage of people do have equally dominant eyes.
Usually, your dominant eye is the same as your dominant hand, but not always. We used to run into this when I was a field sports aid at Boy Scout camp. A right-handed kid would pick up a rifle and do all sorts of contortions to sight with his left eye. We’d then have to convince them to shoot left handed, since it’s more important to see well to aim than it is to pull the trigger with your right hand.