Hi Bob ...
I'm glad that you're not my doctor!
Your post is partially correct. Our blood is red. The blood that
flows in the veins id a darker red because the oxygen in the cells
has been exhausted, i.e., it's used blood. The blood in arteries is
a bright red, as it's freshly oxygenated.
You are correct about the retina cells (cones, specifically, I
think) that cause the red eye effect (in humans) the green color in
some cats, and yellow in other cats and mammals.
--
Shel Belinkoff
mailto:[EMAIL PROTECTED]
"... there is no point in pressing the shutter
unless you are making some caustic comment
on the incongruities of life" - Phillip Jones Griffiths
Bob Walkden wrote:
>
> Hi,
>
> I'm no doctor (trust me), but isn't it the case that mammalian blood is
> not red but blue when it's in the veins? It only turns red when it
> oxidises (eg when it comes out of your veins). This would suggest that
> red-eye is not a reflection off blood vessels, but off the retina
> itself, which is a collection of cells. Different animals have different
> coloured retinas, I believe, so they have different coloured red-eye.
> I think it is also the case that some people (cat people, perhaps)
> have non-red retinas.
>
> ---
>
> Bob
>
> mailto:[EMAIL PROTECTED]
>
> Wednesday, May 23, 2001, 10:06:56 PM, you wrote:
>
> > On 23 May 2001, at 9:38, [EMAIL PROTECTED] wrote:
>
> >> Ayash,
> >>
> >> You understand that red-eye because you show the illumination of the red
> >> blood vessels at the rear of the eyeball in your photo.
>
> > Which leads me to the question; do cats eyes have green blood vessels?
>
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