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http://www.pbs.org/wgbh/evolution/library/01/1/l_011_01.html
I was not yet aware of the fact that Darwin foresaw the eye to be a difficult case for his new theory to explain, so this is news to me...but perhaps some of you, as students/optometrists/etc., have encountered this argument before?
I was not yet aware of the fact that Darwin foresaw the eye to be a difficult case for his new theory to explain, so this is news to me...but perhaps some of you, as students/optometrists/etc., have encountered this argument before?
"If evolution occurs through gradations, the critics say, how could it have created the separate parts of the eye -- the lens, the retina, the pupil, and so forth -- since none of these structures by themselves would make vision possible? In other words, what good is five percent of an eye?"