Sometimes that straw can scratch the eye.
I've thought about that too. I did have her sitting on timothy hay, but she burrowed her body deep in the nest it was touching the hard surface of the kennel, so I added this straw for extra cushion. This eye thing probably not as bad as a cracked egg and a dead embryo... or several since it does get messy. I'll try to get more timothy hay next time... it's just so expensive!