A literature review of eye evolution theories was completed. It was concluded that all attempts to explain the existence of the vertebrate eye by Darwinian evolution have failed. The eye is an excellent example of intelligent design and effectively illustrates the concept of irreducible complexity. In spite of numerous attempts during the past 150 years since Darwin, evolutionists have failed to offer a viable theory of eye evolution. The areas reviewed include its anatomy, physiology, genetics, and fossil record.