Charles Darwin himself realized that it seemed incredible that evolutionary processes had to explain human vision. He said:
'To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree.'
Yet, later on in the same chapter of his book, he explained how he believed it evolved anyway. Had Darwin had the knowledge about the eye and its associated systems that man has today (which is a great deal more than what it was in his time), he may have given up his naturalistic theory on the origin of living things.
Think of how challenging it would be for a human to create the genetic code needed to produce the fine-tuned nervous system that makes precise, coordinated muscular movements possible. When Darwin made his assumptions about the origin of organs, he had nothing like the knowledge we have today. There is indeed abundant evidence of the Creator’s handiwork in all we see around us, AND what we see with.
One gets the impression that plants, animals, and microbes have been going on their merry way, dividing and reproducing and evolving in ways that make sense to us humans. But fungi, they are like that guy who sits by himself at lunch all the time and wears really odd pants and then one day you find out he’s a world-famous abstract artist with an ether habit. Just completely off the reservation, biology-wise.