Poor sheep, and a shame about his eye. But at least he will not have the pain of the horn sticking in it now, so well done on acting so quick.
Many years ago, my Dad had a big Toggenburg nanny. When he got her one horn curled round into her eye, and he was worried it would stick in the eye itself. The vet came, and my dad held the nanny down, and the vet sawed at the horn. Whatever he did, it did not grow again. I was only a child but can remember it clearly.