Actually the history of the eye has been farily well understood, and the various stages of its evolution can be seen in animals that exist today. Dawkins explains it: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Nwew5gHoh3E" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Nwew5gHoh3E</a>