I'm sorry for the little guy's loss. Still, that's amazing--I've never seen a cyclops ball python before. The condition is called holoprosencephaly.
http://en.wikipedia.org/wiki/Holoprosencephaly

Whenever you're breeding animals of any kind, there's always a chance for these types of things. Reproduction doesn't always go perfectly. I try to keep it in perspective--these things would happen in the wild as well as in our care, and we can end the little one's suffering quickly.

It's an example of the amazing complexity of a living thing--how many things have to go just right to produce a viable baby is astounding.