Do boss-eyed people see double vision?

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Offline John Chapman

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Do boss-eyed people see double vision?
« on: 25/02/2009 00:13:06 »
Do boss-eyed people see double vision? By boss-eyed I meant an outward deviation of one eye to cause what is called an exotropic squint. Like Marty Feldman has:

[attachment=7152]
 

How do these people perceive the world? Do they see two images superimposed on top of each other? Or split vision? Is one eye dominant so that one image disappears? Can they swap between seeing the image from one eye or the other? Can they see depth without binocular vision? How does this compare with the vision of animals that have their eyes set in either side of the head such as chameleons and many ground living birds?

I'm hoping that someone in Naked Scientist land either has this condition or knows someboy who does and can answer these questions
« Last Edit: 25/02/2009 00:14:57 by John Chapman »

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Offline graham.d

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Do boss-eyed people see double vision?
« Reply #1 on: 25/02/2009 13:14:15 »
This is not uncommon in children. I believe it is important to have this corrected early because the brain effectively ignores one eye which can become a condition difficult to recover from if left too long. Certainly the human brain is not configured to interpret the images that would come from two "independent" eyes; this is not the case (presumably) with animals who have this as a deliberate feature. Most predators have binocular vision requiring two forward facing coordinated eyes.

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #2 on: 26/02/2009 07:57:31 »
This is not uncommon in children. I believe it is important to have this corrected early because the brain effectively ignores one eye which can become a condition difficult to recover from if left too long.
Before the age of 5 or 6 I believe...
After 6, it becomes permanent.
« Last Edit: 26/02/2009 08:01:48 by Chemistry4me »

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #3 on: 26/02/2009 08:00:36 »
Now strabismus is corrected very early in life, before age 4, when normal vision can still be restored.

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Offline lancenti

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Do boss-eyed people see double vision?
« Reply #4 on: 26/02/2009 13:40:22 »
How do they correct it, though? Seems hard to teach coordination...

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #5 on: 26/02/2009 13:57:19 »
I have a "lazy" eye, in that my left eye wanders if I don't concentrate, or often when I shift from close to far focus. This is something that I have always had, and was due for operations etc when I was a child (though for some reason didn't - no idea why). I was given many exercises to correct this and to strengthen various muscles. I believe the operation would have been to shorten a muscle.

I can voluntarily move my eyes independently and be looking directly at someone even though it appears that I'm looking elsewhere (difficult to explain...). But, even though my eyes are looking at different fields, they are both in focus, but the overlaying image is at a 5 angle. When I do this, the vision is almost exactly the same as it is in a film when they portray the vision of someone who is drunk or has just been whacked on the head. Therefore, I don't do it too often!

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #6 on: 27/02/2009 03:50:21 »

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Offline Chemistry4me

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« Reply #7 on: 27/02/2009 03:51:45 »
Whoa! I feel dizzy just looking at that picture!

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #8 on: 27/02/2009 03:58:53 »
Are your eyeballs like any of these dentstudent?

[attachment=7211]

http://www.cigna.com/healthinfo/zm6098.html

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Offline RD

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Do boss-eyed people see double vision?
« Reply #9 on: 27/02/2009 04:13:01 »
But can you do this ...


[attachment=7217]
« Last Edit: 27/02/2009 04:16:05 by RD »

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #10 on: 27/02/2009 04:14:14 »
How do they correct it, though? Seems hard to teach coordination...
Glasses, eye-patches, drug treatments, botulinum toxin, surgery and eye exercises used in addition to other treatments.

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #11 on: 27/02/2009 04:14:56 »
But can you do this ...

[attachment=7215]


Whoa? How do you do that!

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Offline RD

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« Reply #12 on: 27/02/2009 04:24:01 »
« Last Edit: 27/02/2009 04:26:50 by RD »

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #13 on: 27/02/2009 04:28:01 »
Why can't I see the picture in my previous post? But I can see your two RD? [???][???]

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Offline RD

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Do boss-eyed people see double vision?
« Reply #14 on: 27/02/2009 04:40:51 »
I corrected (deleted) the attachment 7215 which you have quoted.

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Offline Chemistry4me

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« Reply #15 on: 27/02/2009 04:47:17 »
Which means? [???]

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Offline RD

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Do boss-eyed people see double vision?
« Reply #16 on: 27/02/2009 05:00:26 »
You are quoting an attachment (#7215) which no longer exists (I deleted it), so no picture in the quote.


[attachment=7223]

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #17 on: 27/02/2009 05:05:48 »
But why can I see your two attachments if you have deleted it?

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Offline RD

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« Reply #18 on: 27/02/2009 05:12:38 »
But why can I see your two attachments if you have deleted it?

Different attachment: #7219


[attachment=7225]
« Last Edit: 27/02/2009 05:16:42 by RD »

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #19 on: 27/02/2009 05:16:35 »
Ah...so I can see #7217 and #7219 but not #7215 [:)]

So if I quote you again.....

But can you do this ...


[attachment=7217]

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Offline Chemistry4me

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« Reply #20 on: 27/02/2009 05:17:54 »
I can see it again. [:)]

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #21 on: 27/02/2009 07:24:00 »
So - back on topic [;)]

I guess it would be esotropia, and I can move each eyeball independently inwards, though much more easily with the left. Or, if you start with both eyes inwards, effectively looking at your nose, I can move each eye back to "normal" position independently.

Off topic:

I can also waggle my ears..... [:D]
« Last Edit: 27/02/2009 07:26:39 by dentstudent »

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Offline Chemistry4me

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #23 on: 27/02/2009 07:30:45 »
Waggle your ears? How do you do that? I can't even imagine trying to do it!

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #24 on: 27/02/2009 07:40:04 »
No, not really like that. That's a single blurry image, rather than 2 overlaid clear images.

How do I waggle my ears? By moving them, same as you would move your fingers. I just can!

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #25 on: 27/02/2009 07:41:06 »
Can you roll your tongue too? [:)]

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #26 on: 27/02/2009 07:55:17 »
Into a tube? Yup. I have some eye photos coming......

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #27 on: 27/02/2009 07:56:30 »



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Offline Chemistry4me

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« Reply #28 on: 27/02/2009 08:14:12 »
Ah, I see what you mean now. [:)]

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #29 on: 27/02/2009 08:15:22 »
You wouldn't happen to know if being able to wag your ears is genetic or not would you? [:)]

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Offline dentstudent

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Do boss-eyed people see double vision?
« Reply #30 on: 27/02/2009 08:36:20 »
Neither of my parents could do it, and neither can my sister. Clearly I'm a freak.

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Offline RD

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Do boss-eyed people see double vision?
« Reply #31 on: 28/02/2009 22:25:59 »
.[attachment=7265]

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Offline Chemistry4me

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« Reply #32 on: 28/02/2009 23:07:27 »
I thought there were three eye pictures? [:)]

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Offline RD

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Do boss-eyed people see double vision?
« Reply #33 on: 01/03/2009 04:15:43 »
You wouldn't happen to know if being able to wag your ears is genetic  

earlobes are ...
 
Quote
For example, in humans, if a person inherits the allele for free earlobes from one parent and the one for attached earlobes from the other, that person will have free earlobes. Thus the free lobe allele is said to be dominant over the attached lobe allele (and the attached lobe allele is said to be recessive to the free lobe allele). In order to have attached earlobes, a person must inherit the allele for attached earlobes from both parents. Note that this doesn't necessarily mean that either parent must have attached earlobes - since both parents could be carrying the allele for attached lobes while outwardly having free lobes.
http://en.wikipedia.org/wiki/Dominance_relationship


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Offline Chemistry4me

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« Reply #34 on: 01/03/2009 04:50:57 »
Indeed, I remember learning that in biology [:)]

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Offline John Chapman

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Do boss-eyed people see double vision?
« Reply #35 on: 02/03/2009 01:11:51 »
Alright, Guys. Getting back to the topic.... [>:(]

All this is very interesting but has anyone got any idea what people with this eye condition actually see?
 

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Offline Chemistry4me

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Do boss-eyed people see double vision?
« Reply #36 on: 02/03/2009 06:39:08 »
What do you mean by 'boss-eyed'? What's the proper term for it?

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Offline John Chapman

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Do boss-eyed people see double vision?
« Reply #37 on: 02/03/2009 09:31:22 »
Hi Chem

By 'boss-eyed' I meant an outward deviation of one eye to cause what is called an exotropic squint. Like Marty Feldman has. With each eye pointing in different directions the person cannot be seeing a single image if both eyes are working.

When I was a kid we had an usher in our local cinema with this condition. When facing a group of us her eyes would each be pointing at a different person. I never knew if she was talking to me or the person 3 feet to my left. Eventually I learned that she was talking to whoever her right eye pointed at, which made me wonder if the right eye had dominance over the left one.

In my student days, if I looked down a microscope for long periods it would give me a headache if I kept my left eye screwed closed while I used my right. Eventually I learned to see through the microscope even though I had both eyes open. If I concentrated on the image through the microscope my brain somehow ignored the image from the other eye which eventually disappeared. I wonder if something similar is happening with 'boss-eyed' people and the image from one of their eyes is dominant over the other.