For Christians (or anyone else) who deny Darwinian evolution.

[SteveII]

I missed the part where you explain how the eye and the associated neural function developed through successive small changes where both are needed to provide a survival benefit. Further, just recognizing light is not a survival benefit. The organism has to be able to do something about it. So, what function evolved first when all three require the others for any survival benefit? 

Tell that to plants.  They don't recognize light, they can't "do anything" about it, they have no nervous system whatsoever...and yet the chemical inevitability of auxin transfer means that they grow toward and track the sun....a hell of a survival benefit for a photosynthesizing organism.

All that's required for auxin transfer to be beneficial is for auxin to be a photophobic growth hormone..which it is.  As far as we can tell, auxin was present in the algae forerunners of plants and not at all used for phototropism, but a much more general form of regulating morphogenesis.

A plants photosynthetic apparatus is a collection of modified light sensitive cells, supported by photophobic morphogens capable of conferring benefits without the addition of any of those other things you imagine to be so crucial for eye spots to be a survival advantage.

I was not talking about light spots. I specifically said "eye and associated neural functions" as an exact quote of DBP's statement: "From there you can evolve the eye and associated neural functions." A magic wand was waived and I want details how component systems evolved functions when they are dependent on each other to confer a survival benefit.