Changing the focus of your eyes?

I've always been competent to do this, normally I have idyllic vision, no visual abnormality at all. Though I've always be able to change the focus of my eyes lacking effort or strain, I can go from watertight vision to completely indistinguishable blurry vision lacking anyone telling if I did or not, I just do it short seemingly use or move a single muscle. I thought everyone could do this but recently a few people told me they have no idea what I was conversation about or that I was lying and couldn't do that.

Can anyone else do this? Should I see a doctor roughly being able to do this?

Answers:    Everybody can changeover the focus of their eyes: they do it every time they change from looking at something close to something far away. It's done using the muscles inside your eyeball which is why you do it without appearing to move any muscles. What you are doing is varying the shape of the lens inside your eye.

Most people are not aware of this focussing and can't do it consciously. I can do it the same as you.
it's call accommodation, normal for relatives up to the age of about 45. Then your eye slowly stops focusing and that's why you need reader when you get old. I can do that too. I'm pretty sure it's common.

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