They are particles on or in the eye fluid.
Which is why you have to change the focus of your eyes, and have a reasonably bright clear scene to make them out.
I have seen them since i was a kid too, everybody has.
Of course the wind wont change them, they are floating in fluid on/in your eye.
I wondered what it was too and asked an optician before, Easiest way to find out is to ask a trained expert.
Here's an explanation:
CLICK ME FOR UNDERSTANDING
Nothing supernatural going on here.
Why do they change when you get butterflies in your stomach?
Hmm, wouldnt be able to answer that, maybe you are changing your heartbeat and increasing the pressure in your body. Perhaps its a version of the ideomotor response (same thing that makes pendulums move... the tiny movements in the body)
but, they are an explainable, proven phenomena which everyone on the planet experiences.
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