On Sat, 03 May 2008 00:39:27 +0200, andrel wrote:

> 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.

Yes, I can vouch for that (I have blue eyes).  My wife's eyes are sort of 
a grey/hazel colour, but the pigment is not uniform, which creates the 
spoke pattern.

>> 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.

Oh, yes, I see what you're saying now.

Jim

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