re: #299 TooDamNice

Did Darwin have issues fitting the human eye into his theory?

If I recall correctly from when I read Origin of Species, no, he had no trouble at all. I may be confounding that with later work, though, work that clearly shows how optical organs evolved from the most primitive of photoreceptor structures in invertebrates.

Note, please, that the eyes of octopus, squid and nautiluses are also highly evolved and comparable to human eyes, and these are mollusks.