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Message: <blockquote data-quote="Biohazard4" data-source="post: 2873023" data-attributes="member: 167906">Yopu misunderstand the nature of optical evolution; the "purpose" wasn't to evolve an eye, for there is no purpose (this is why the eye has evolved at least none times independently around the animal kingdom); the point is that as there is no end intention (remember, the watchmaker is blind), any improvement on visibility is to be welcomed. Start with a single light-sensitive cell, and within half a million years (which is peanuts on the geologic scale), you'll have a fully functioning eye. Gradual steps, remember? Nature ratchets up what works (even slightly improved visibility improves the chances of evading a predator), and the rest gets eaten.Now, how does that NOT answer your question?</blockquote>