The eye is the result of iterative development over millions of years.
Reverant
No. You either see or you don't. You can't have half an eye!
Pedant
The nautilus has a pinhole for an eye.
Reverant
Look, one day nothing could see because it didn't exist. Then bam! Everything existed. Then bam bam! God said let there be sight. And there was sight. See?
Pedant
The human eye is better than that of a nautilus but worse than that of an eagle. Explain that.
Reverant
Eagles need to see the ground better from up there. Man can just stare at it or get nearer. Anyway, God gaveth each its own dominion.
Pedant
What about the nautilus?
Reverant
What about it?
Pedant
Why did God give it a pinhole eye?
Reverant
There's nothing to see at the bottom of the sea. It's boring.