Half-astigmatism - what is it?

Question

Once I had an eye-check at a place, and I was told I have a half-astigmatism. What is that?

Answer 1

An astigmatism is what it's called when the eye is not completely rounded. This can distort the vision. I think it can change, having been told at one time I had an astigmatism, but didn't afterward. Wonder if the claim was wrong the first time?
(P.S. Could that have been that you Have astigmatism instead of half?)