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Your eyes will adjust to the available light. Outside on a sunny day, the iris of the eyes will contract to limit the amount of incoming light. When you walk inside, your contracted iris doesn't allow much light, and so things appear to be very dark. After a few seconds, the iris of your eyes will dilate or expand, allowing more light in. when you walk back outside, you instinctively squint your eyes to limit the amount of light, allowing the iris to contract again.

It's an entirely automatic process; we don't have to think about it.

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8y ago
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Q: Why cant you see properly when you come inside from a sunny day?
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