ELi5: When we go outside at night, what happens to our eyes so that they adjust to dark and we’re able to see?

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I’m sure everyone knows what I’m talking about, but I’m genuinely curious as to what the process in our eyes and brain is, so that after a period of time we’re able to see relatively well even without much moonlight.

In: Biology

3 Answers

Anonymous 0 Comments

Primarily it’s that your pupils (the black circle in the center of your eye) dilates (expands) to let in more light. In a bright sunny day your pupils are tiny pin-pricks, at night they get much much bigger.

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