Yup, can dilate my pupils too
There's plenty of others that can do it. Our eyes are muscles that we voluntarily use but most of us don't really think about it when we use them, its just a thing we do. Alls this means is that you're able to access your eye muscles and move them in a controlled manner, constricting and relaxing. The blurring of the vision is accommodation, same things your eyes do when you enter dark room.
Ehhh... I mean, yeah, kinda, but what he's talking about is consciously unfocusing them, like... Being able to look at something and have your vision unfocus without moving your head or eyes to be looking elsewhere.