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In bright light, a cat's pupil will narrow to a slit to stop too much light getting in, which can be harmful to its eyes. In dim light, the pupil will get much bigger to let the light in, making it easier for the cat to see in dim light.

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15y ago
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13y ago

When a cat is relaxed in bright light, the eyes will be slitted and narrow in order to protect the cornea inside the eye from damage. When a cat is excited or scared, the pupil will open up in order to let more visual information enter the eye, even in bright light. This happens in humans as well, but is not as pronounced as it is with cats.

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Q: Why are the pupils of cats eyes sometimes large and at other times thin slits?
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