FAR FROM PERFECT. “Darwin’s hypothesis concerning the evolution of the complex eye through stepwise selection is being corroborated. Not only is the human eye homologous to those simpler light-sensitive organs in other animal lineages, but as an organ developed via the opportunistic twists and turns of evolutionary processes, it is also far from being a perfectly engineered machinery, and exhibits major flaws from a designer’s perspective.”
http://onlinelibrary.wiley.com/doi/10.1111/nph.12416/full