The eye is so complex that even Charles Darwin could not explain how it could have formed. Now it turns out that the evolution of the vertebrate eye got a boost from an unexpected direction: namely, from bacteria, which contributed a key gene involved in how the retina responds to light. The work, the in the Proceedings of the National Academy of Sciences has been publishedunderscores the evolutionary importance of genes borrowed from other species.
Why humans owe their eyesight to bacteria – Knowledge
