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Things Evolution Can't Evolve?


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#161 Salsa

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Posted 06 September 2013 - 06:33 AM

The list goes on.

 

No, the list doesn't go on. Quite the opposite. For example, the list of "vestigial organs" in humans has shrunk from 180 in 1890 to ZERO in 1999.



#162 Dig4gold

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Posted 06 September 2013 - 11:13 AM

I read this article about the eye many years ago and it has always stuck with me. I guess you could say it is in my mind's eye.

 

Light at various wavelengths is capable of very damaging effects on biological machinery. The retina, besides being an extremely sophisticated transducer and image processor, is clearly designed to withstand the toxic and heating effects of light. The eye is well equipped to protect the retina against radiation we normally encounter in everyday life. Besides the almost complete exclusion of ultraviolet radiation by the cornea and the lens together, the retina itself is endowed with a number of additional mechanisms to protect against such damage:

  • The retinal pigment epithelium produces substances which combat the damaging chemical by-products of light radiation.

  • The retinal pigment epithelium plays an essential part sustaining the photoreceptors. This includes recycling and metabolising their products, thereby renewing them in the face of continual wear from light bombardment.

  • The central retina is permeated with xanthophyll pigment which filters and absorbs short-wavelength visible light.

The photoreceptors thus need to be in intimate contact with the retinal pigment epithelium, which is opaque. The retinal pigment epithelium, in turn, needs to be in intimate contact with the choroid (also opaque) both to satisfy its nutritional requirements and to prevent (by means of the heat sink effect of its massive blood flow) overheating of the retina from focused light.

If the human retina were ‘wired’ the other way around (the verted configuration), as evolutionists such as Dawkins propose,2 these two opaque layers would have to be interposed in the path of light to the photoreceptors which would leave them in darkness!

Thus I suggest that the need for protection against light-induced damage, which a verted retina in our natural environment could not provide to the same degree, is a major, if not the major reason for the existence of the inverted configuration of the retina.

 

http://www.answersin...j/v13/n1/retina






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