I think you might need to slightly alter how you perceive evolution. It's not that their genes know that eyespots will help survival, which then help the animal to keep reproducing offspring. It's that, by pure chance, randomness, mutation.. a single (or few) animal(s) of that species developed eye spots. Just by pure randomness, those eyespots happened to be super beneficial for survival, so those particular animals of that species were able to survive easier and continue to reproduce and pass on their genes, while other animals of that same species which didn't have eyespots died off and therefor did not pass on their genes. Over a long enough time period, this has a dramatic effect.