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Hi. My name is Dr Rick and I have two decades of ophthalmology experience. I'm online and happy to answer your question today. I am an retina surgeon.
The gas bubble, depending on what gas was used, will slowly go away over the next 4 to 21 days.
As the bubble shrinks you will start to see it inside your eye and, yes, it will move around as you move your head and eyes. This is nothing to worry about.
Your body replaces the gas bubble with fluid so, just in case you were wondering, your eyeball is never "empty"
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