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I'm actually a professional person who has studied biology and bio-mechanics and you're wrong. The human blind spot for example, does not need to exist. Octopi have very similar eyes with no such problem.
A black and white world is a problem for me. Not so much for them.
Well, last time I checked, most of the processing occurs in the occipital cortex, which is in the back of your head, not even close to your eyes. Pretty weird configuration, by the way. If I had designed humans, I would put the region concerned with seeing near the eyes.Human eyes deal with higher heat levels both from the nerves doing the processing and heat from the light.
Because otherwise, they would suffer heat damage, or what? That's the first time I hear something like that. The receptors in your skin have no problem dealing with relatively intense heat, why would your retina have problems dealing with light?As such, the nerves must be short and "leave the area" by the shortest route possible.
They would be better without a blind spot, though. And the retina being the first layer is still an odd configuration.Our eyes are a vastly superior design for how we use them.
Mantis Shrimps have cooler eyes. They have depth-perception in each eye and can see a dozen or so colors and even perceive circular polarized light.Plus ours can adapt fairly quickly to new environments.
http://www.cell.com/current-biology/abstract/Superior Underwater Vision in a Human Population
"Charles Darwin was stumped by the human eye."
A Closer Look at the Human Eye: 10 Fascinating Facts | My Local Connect
A black and white world is a problem for me. Not so much for them.
Not all octopi are color blind. So, I guess black and white world was a problem for some of them too. Also, they can also detect light polarization as small as one degree. So, yea... no blind spot, color vision, and polarization, not to mention they evolved their eyes separately from humans.
Science Links Japan | Color Discrimination Conditioning in Two Octopus Octopus aegina and O. vulgaris.
It varies species to species. Nothing to do with the placement of the optic nerve though. I'm still curious as to how the placement of this nerve helps cool the eye.
The receptors in your skin have no problem dealing with relatively intense heat, why would your retina have problems dealing with light?
And the blind spot does not exist to anyone who keeps both eyes open. The blind spot test requires you shutting one eye which causes you to lose about 70 degrees of vision on the close side plus lose the 3d image. This is why smart people walk around with both eyes open.
Science Links Japan | Color Discrimination Conditioning in Two Octopus Octopus aegina and O. vulgaris.
It varies species to species. Nothing to do with the placement of the optic nerve though. I'm still curious as to how the placement of this nerve helps cool the eye.
Only when the field of view of both eyes overlaps. In many animals it doesn't. How do you explain that?
I suggest you do your research and we do ours. I'm certainly not going to do your work for you.Curiosity results in research. A good start.
Your eyes aren't magnifying glasses. They focus the light, true, but so do camera lenses, and I never, ever heard of a mundane camera lens overheating the inside of the camera.It has to do with the lens thing focusing the light stuff on an smaller section of receptor thingies.
Your eyes aren't magnifying glasses. They focus the light, true, but so do camera lenses, and I never, ever heard of a mundane camera lens overheating the inside of the camera.
That would have been my second question. The overheating-eye-hypothesis fails on so many levels, it's astonishing.Even if the eye was subject to significant heat issues, I'm still curious about how exactly the optic nerve causing a blind spot would in any way alleviate that.
So yeah, heating from processing is not an issue. Otherwise, your brain would have ceased to function a long, long time ago. Why would your optic nerves overheat from the processing, but not the billions of nerves that are right inside your head, clumped together?
Do you have sources for your claim that significant and potentially harmful chemical heating occurs in your eyes?Photon recognition uses a complex chemical process that needs both temperature cooling and removal of waste products.
Humans have one rod and three cone types, compared to cephalopods that have only rods. The superior design we have
requires better blood flow to handle the chemical heating that results. This lead to an inverted arraignment and results in
both better sensitivity and versatility to broader conditions.
What do the different timespans have to do with cephalopods getting more false-positive results when perceiving movements?The cycle time for rods to be ready for use after one "hit" is 5 minutes but 1.5 minutes for cones. As a result cephalopods
often mistake anything that moves as food because their eyes are designed for low light conditions and to detect movement
more than any detail.
Yes, humans can perceive colors, but what does this have to do with the heating issue? As far as I can see, nothing.The combination of rods and cones allow fast adaption to changing light conditions, ability to see more detail rather than
movement, ability to handle high energy (bright sunlight) conditions, all make the human eye superior to cephalopods.
The very minor issue of one blind spot has absolutely no effect on the ability of humans to live long lives and reproduce.
When it comes to describing evolution, yes.And as far as evolutionists care, that's all that is important.
Do any of these sources mention chemical heating that has to be alleviated with an increased blood flow to the photoreceptors in your eyes?Coulombre, A. 1994. Roles of the retinal
pigment epithelium in the development
of ocular tissue. In Zinn, K.M., and M.F.
Marmor (editors), The Retinal Pigment
Epithelium, pp. 53–57. Harvard University Press, Cambridge, MA.
Dalton, R. 2004. True colours. Nature
428:596–597.
Dowling, J.E. 1987. The Retina: An Approachable Part of the Brain. The
Belknap Press of Harvard University
Press, Cambridge, MA.
Jeffery, G., and A. Williams. 1994. Is abnormal retinal development in albinism only a mammalian problem?
Normality of a hypopigmented avian retina. Experimental Brain Research 100:47–57.
Kolb, H. 2003. How the retina works. American Scientist 91:28–35.
Kuwabara, T. 1994. Species differences in
the retinal pigment epithelium. In Zinn,
K.M., and M.F. Marmor (editors), The
Retinal Pigment Epithelium, pp. 58–82.
Harvard University Press, Cambridge,
MA.
Martínez-Morales, J.R., I. Rodrigo, and P. Bovolenta. 2004. Eye development: a view
from the retina pigmented epithelium.
BioEssays 26:766–777.
Animals are different. Even their eyes.
Do you have sources for your claim that significant and potentially harmful chemical heating occurs in your eyes?
What do the different timespans have to do with cephalopods getting more false-positive results when perceiving movements?
My sources covered this as a minor point, though I thought it more important in my memory. Just as you can think of nothing else.Yes, humans can perceive colors, but what does this have to do with the heating issue? As far as I can see, nothing.
What else is there in your world? Magic? Dreams?When it comes to describing evolution, yes.
Do any of these sources mention chemical heating that has to be alleviated with an increased blood flow to the photoreceptors in your eyes?
This doesn't address what I said at all. If an animal with eyes where the optic nerve passes through the retina does not have stereoscopic vision, then it will have blind spots.
That would have been my second question. The overheating-eye-hypothesis fails on so many levels, it's astonishing.
Do go on. Please explain how nerve bundle placement assists in cooling the eye. Octopus do not always live at 5000m depth, but sometimes quite shallow water that's warmer than say, Norway.
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