You are refocusing your vision manually as opposed to atomatically. Typically our eyes require some object to focus on. We don't notice then if the world between our eyes and that object is out of focus becuase our brain is not focused on that part of the world. When you refocus manually to a point closer or farther away, your vision seems to get blurry. It is not uncommon, but is like flexing the muscle attached to the coccyx, many people just never try to do it.
Probably your optometrist just didn't understand what you were trying to explain. Do it with one eye and you can start manipulating the finer muscles around the iris.
peace
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The world is complicated - that which makes it up is elegantly simplistic, but infinitely versatile.
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