Jim Henderson wrote:
> On Fri, 02 May 2008 23:42:53 +0200, andrel wrote:
> 
>>> Oh, we both have found it very fascinating - her ophthalmologist took
>>> pictures of her eyes - most people you get a bright center (from the
>>> reflection off the retina), but for those with this condition, it's not
>>> uncommon for the iris to "leak" light and for the photo to show a
>>> "spoke" pattern outside the pupil area.
>> I think that also the white of the eye may transmit more. [..]
> 
> Possibly.
Drawing from what I heard from someone studying scattering of light in 
the eye. People with less pigment had more light coming in from all 
sides than people with more pigment. i.e. blue eyed people having more 
problems with headlight of cars approaching.
> 
> 
>>> but her brain doesn't have enough practice at calculating the distance
>>> of an object moving based on those two reference points, and as a
>>> result, she has very poor eye-hand coordination when it comes to
>>> catching something thrown in her direction, because in order to figure
>>> out how far away something is, she actually has to think about it,
>>> while those who don't have the problem don't have to think about it. 
>>> According to her doctor, it comes back to things not being hooked up
>>> correctly between the optics and the brain.
>> Makes sense. With the two images far away in disjoint parts of the
>> visual cortex it would be hard to combine the information. Hmm, I wonder
>> if the condition is more severe in man. IIRC the two halves of the brain
>> do communicate more in women.
> 
> From the wikipedia article on OA, there are variants that affect men that 
> don't affect women.  

That's not what I meant. I meant that if the image of the left eye ends 
up in the right visual cortex and vice versa, you need to communicate 
between the two brain halves to match them. BTW I see now that the 
problem with the optic nerve is only mentioned somewhere low on the 
page. For some reason I remembered it as being quite common.

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