Intelligent Design, the best explanation of Origins

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Intelligent Design, the best explanation of Origins » Intelligent Design » Main topics on the origin of eyes

Main topics on the origin of eyes

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1 Main topics on the origin of eyes on Fri Apr 13, 2018 7:31 pm


Main topics on the origin of eyes

Origin of eyespots - supposedly one of the simplest eyes

How the origin of the human eye is best explained through intelligent design

The irreducible complex system  of the eye, and eye-brain interdependence

Volvox , eyespots, and interdependence

Origin of phototransduction, the visual cycle, photoreceptors and retina

Photoreceptor cells point to intelligent design

Origin of phototransduction, the visual cycle, photoreceptors and retina

The human eye consists of over two million working parts making it second only to the brain in complexity. Proponents of evolution believe that the human eye is a product of millions of years of mutations and natural selection. As you read about the amazing complexity of the eye please ask yourself: could this really be a product of evolution?

Automatic focus
The lens of the eye is suspended in position by hundreds of string like fibres called Zonules. The ciliary muscle changes the shape of the lens. It relaxes to flatten the lens for distance vision; for close work it contracts rounding out the lens. This happens automatically and instantaneously without you having to think about it.
How could evolution produce a system that even knows when it is in focus? Let alone the mechanism to focus.
How would evolution produce a system that can control a muscle that is in the perfect place to change the shape of the lens?

A visual system
The retina is composed of photoreceptor cells. When light falls on one of these cells, it causes a complex chemical reaction that sends an electrical signal through the optic nerve to the brain. It uses a signal transduction pathway, consisting of 9 irreducible steps. the light must go all the way through. Now, what if this pathway did happen to suddenly evolve and such a signal could be sent and go all the way through.  So what?!  How is the receptor cell going to know what to do with this signal?  It will have to learn what this signal means.  Learning and interpretation are very complicated processes involving a great many other proteins in other unique systems.  Now the cell, in one lifetime, must evolve the ability to pass on this ability to interpret vision to its offspring.  If it does not pass on this ability, the offspring must learn as well or vision offers no advantage to them.  All of these wonderful processes need regulation.  No function is beneficial unless it can be regulated (turned off and on).  If the light sensitive cells cannot be turned off once they are turned on, vision does not occur.  This regulatory ability is also very complicated involving a great many proteins and other molecules - all of which must be in place initially for vision to be beneficial. How does evolution explain our retinas having the correct cells which create electrical impulses when light activates them?

Making sense of it all
Each eye takes a slightly different picture of the world. At the optic chiasm each picture is divided in half. The outer left and right halves continue back toward the visual cortex. The inner left and right halves cross over to the other side of the brain then continue back toward the visual cortex.Also, the image that is projected onto the retina is upside down. The brain flips the image back up the right way during processing. Somehow, the human brain makes sense of the electrical impulses received via the optic nerve. The brain also combines the images from both eyes into one image and flips it up the right way… and all this is done in real time. How could  natural selection recognize the problem and evolve the mechanism of  the left side of the brain receiving the information from the left side of both eyes and the right side of the brain taking the information from the right side of both eyes? How would evolution produce a system that can interpret electrical impulses and process them into images? Why would evolution produce a system that knows the image on the retina is upside down?

Constant level of light
The retina needs a fairly constant level of light intensity to best form useful images with our eyes. The iris muscles control the size of the pupil. It contracts and expands, opening and closing the pupil, in response to the brightness of surrounding light. Just as the aperture in a camera protects the film from over exposure, the iris of the eye helps protect the sensitive retina. How would evolution produce a light sensor? Even if evolution could produce a light sensor.. how can a purely naturalistic process like evolution produce a system that knows how to measure light intensity? How would evolution produce a system that would control a muscle which regulates the size of the pupil?

Detailed vision
Cone cells give us our detailed color daytime vision. There are 6 million of them in each human eye. Most of them are located in the central retina. There are three types of cone cells: one sensitive to red light, another to green light, and the third sensitive to blue light.
Isn’t it fortunate that the cone cells are situated in the center of the retina? Would be a bit awkward if your most detailed vision was on the periphery of your eye sight?
Night vision

Rod cells give us our dim light or night vision. They are 500 times more sensitive to light and also more sensitive to motion than cone cells. There are 120 million rod cells in the human eye. Most rod cells are located in our peripheral or side vision. it can modify its own light sensitivity. After about 15 seconds in lower light, our bodies increase the level of rhodopsin in our retina. Over the next half hour in low light, our eyes get more an more sensitive. In fact, studies have shown that our eyes are around 600 times more sensitive at night than during the day. Why would the eye have different types of photoreceptor cells with one specifically to help us see in low light?

The lacrimal gland continually secretes tears which moisten, lubricate, and protect the surface of the eye. Excess tears drain into the lacrimal duct which empty into the nasal cavity.
If there was no lubrication system our eyes would dry up and cease to function within a few hours.
If the lubrication wasn’t there we would all be blind. Had this system not have to be fully setup from the beginning?
Fortunate that we have a lacrimal duct aren’t we? Otherwise, we would have a steady stream of tears running down our faces!

Eye lashes protect the eyes from particles that may injure them. They form a screen to keep dust and insects out. Anything touching them triggers the eyelids to blink.
How is it that the eyelids blink when something touches the eye lashes?

Operational structure
Six muscles are in charge of eye movement. Four of these move the eye up, down, left and right. The other two control the twisting motion of the eye when we tilt our head.
The orbit or eye socket is a cone-shaped bony cavity that protects the eye. The socket is padded with fatty tissue that allows the eye to move easily. When you tilt your head to the side your eye stays level with the horizon.. how would evolution produce this? Isn’t it amazing that you can look where you want without having to move your head all the time? If our eye sockets were not padded with fatty tissue then it would be a struggle to move our eyes.. why would evolution produce this?

Poor Design?
Some have claimed that the eye is wired back to front and therefore it must be the product of evolution. They claim that a designer would not design the eye this way. Well, it turns out this argument stems from a lack of knowledge.

The idea that the eye is wired backward comes from a lack of knowledge of eye function and anatomy.
Dr George Marshall

Dr Marshall explains that the nerves could not go behind the eye, because that space is reserved for the choroid, which provides the rich blood supply needed for the very metabolically active retinal pigment epithelium (RPE). This is necessary to regenerate the photoreceptors, and to absorb excess heat. So it is necessary for the nerves to go in front instead.

The more I study the human eye, the harder it is to believe that it evolved. Most people see the miracle of sight. I see a miracle of complexity on viewing things at 100,000 times magnification. It is the perfection of this complexity that causes me to baulk at evolutionary theory.
Dr George Marshall

Evolution of the eye?
Proponents of evolutionary mechanisms have come up with how they think the eye might have gradually evolved over time but it’s nothing more than speculation.
For instance, observe how Dawkins explains the origin of the eye:

Observe the words ‘suppose’, ‘probably’, ‘suspect’, ‘perhaps’ & ‘imagine’? This is not science but pseudo-scientific speculation and storytelling. Sure, there are a lot of different types of eyes out there but that doesn’t mean they evolved. Besides, based on the questions above you can see how much of an oversimplification Dawkins presentation is.

The human eye is amongst the best automatic camera in existence. Every time we change where we’re looking, our eye (and retina) is changing everything else to compensate: focus & light intensity is constantly adjusting to ensure that our eyesight is as good it can be. Man has made his own cameras… it took intelligent people to design and build them. The human eye is better than the best human-made camera. How is the emergence of eyes best explained, evolution, or design ?!

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