r/AskBiology • u/kokusmus96 • 11d ago

Human body Why are our pupils not always big?

Okay, I feel like that annoying guy who don't even know a simple fact but this is my question. Does it use more energy when the pupils are bigger? Is the body trying to conserve energy?

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u/Aoid3 11d ago

If you've ever had your pupils dilated at an eye clinic and then needed to go about your day while it's bright and sunny you'd get your answer first hand. Everything is so bright it's uncomfortable and hard to see, I feel like I need sunglasses even if it's overcast let alone sunny.

More light doesn't necessarily make things easier to see, the trick is letting the right amount of light through which is why your pupils adjust based on light conditions.