It might seem strange to some that he hadn't, but growing up his parents had taught him to be very careful with his abilities. And that was still there in the back of his mind to some extent. Showing off and letting loose simply to see what he could do wasn't something that came naturally.
He did nod at the name for his vision.
"X-Ray vision is a good way to describe it. I choose not to use it unless lives are in peril," he said, knowing that this was one ability that could certainly infringe on privacy and understanding that it might be one of his more unnerving abilities.
"I can freeze things with my breath too," he added, realizing that he had forgotten to mention that one.