Trilobites are supposed to be primitive prehistoric creatures. So how did they get such good eyes?

A recent Chick tract I received contained some interesting information about supposed eye evolution. “Evolutionary textbooks speculate that eyes gradually evolved from dark spots on the skin. They support eye evolution with an example: Fish that live for many generations in dark caves lose their eyesight.” This is true but losing one’s sight is a far cry from evolving sight from nothing!
To complicate this theory beyond credulity, enter the trilobites! These marine creatures are extinct today but lived in abundance prior to the flood. Evolutionists place them in the Cambrian period which would be supposedly 570 million years ago. For the sake of argument, let’s concede these dates temporarily. “Fossils from before the Cambrian were of soft bodied, mostly microscopic life. While fossil trilobite (eye) lenses are found by the thousands, the fossil record offers no evidence of lenses, or even of animals on which lenses could have been mounted, prior to the trilobites.” The author then quotes Atheistic evolutionist paleontologist Niles Eldredge of the American Museum of Natural History. “These lenses … optimize both light collecting and image formation better than any lens ever conceived. We can be justifiably amazed that these trilobites, very early in the history of life on Earth, hit upon the best possible lens design that optical physics has ever been able to formulate.” This is clearly an example of willful ignorance. How does a tiny sea creature ‘hit upon’ anything, let along a perfectly formed lens for an eye?!
The tract concludes, “No fossil evidence has been found of any dark spots or less evolved eyes, from which these most perfect lenses could have evolved. Instead, the evidence leads us to conclude that God designed and created trilobite eyes on purpose to work well.” Amen, and amen!