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In your eye? That is the iris (not a halo). Your iris is actually a sphincter (a circular muscle) and it will expand or constrict to control how much light is let into your eye. That is why in dim light your pupil will be really big, because it is opening wide to try to let in as much light as possible so you can see better.

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Q: Why have you got a halo around your pupil?
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