Twenty Two Years And Counting.
ChatterBank0 min ago
Glow Behind Eyes
8 Answers
So ... out with dogs tonight with a torch:... got me thinking....
When a person (or animal) dies wld their eyes still “glow” when a torch beam shone in them? Wld a dead person / animal still get that “red eye” effect when a photo is taken with a flash?
If not.... then what causes the “glow” in a living creatures eyes?
When a person (or animal) dies wld their eyes still “glow” when a torch beam shone in them? Wld a dead person / animal still get that “red eye” effect when a photo is taken with a flash?
If not.... then what causes the “glow” in a living creatures eyes?
Answers
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its a reflection of the back of the eye https:/
and why they glow green https:/
There's a very funny short story by James Thurber called the 'Topaz Cufflinks Mystery' first published in the New Yorker which this reminds me of, does anyone know it? https:/
have any of the biologists said tapetum?
https:/
dim light - the retinal cells get a second go
which make them even sensitiver ( as alice wd say)
When I was doing Phys with sir colin blakemore ( sir later that is - much later) 3 photons was sufficient to fire a retinal cell.
which is just a little too many for 'is there a photon there?' if the cell doesnt fire. - quantum effects in retinal phys.
( light intensity so low that 'did that photon fire the cell?' competes with 'light intensity so low that was there a photon there?
we had really good visual physiology lectures at cambridge
https:/
dim light - the retinal cells get a second go
which make them even sensitiver ( as alice wd say)
When I was doing Phys with sir colin blakemore ( sir later that is - much later) 3 photons was sufficient to fire a retinal cell.
which is just a little too many for 'is there a photon there?' if the cell doesnt fire. - quantum effects in retinal phys.
( light intensity so low that 'did that photon fire the cell?' competes with 'light intensity so low that was there a photon there?
we had really good visual physiology lectures at cambridge
thanks for the question eve
the wiki article is like my old zoo-otobly lectures
you have a sign - red eye and this is how a variety of animals solve it - now what conclusions can we draw from the info ?
evo devo has sortta changed a lot since they found a retinal mamalian protein in an insect eye
completely unexpected
the wiki article is like my old zoo-otobly lectures
you have a sign - red eye and this is how a variety of animals solve it - now what conclusions can we draw from the info ?
evo devo has sortta changed a lot since they found a retinal mamalian protein in an insect eye
completely unexpected
1 to 8 of 8
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