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The reason behind why your pupils dilate is because they need to receive more light from their surroundings when it is dark, enabling you to see better. They expand and take in more light, allowing you to see.

They contract again when exposed to a lot of light. You can test this by having someone close their eyes and when they open you can have them look directly at a light and you can see their pupils shrink if you look closely.

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Q: Why do people eyes dilate while they are talking to you?
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