Why does our vision appear blue after having closed eyes in the sun for too long?

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Why does our vision appear blue after having closed eyes in the sun for too long?

In: Biology

Your visual system tries to adapt to current conditions in a variety of ways. In this case, closed eyes in bright sun mean a lot of reddish glow from the light that manages to penetrate your eyelids. You brain starts adapting to this by turning down how strongly it responds to red. When you open your eyes, your retina is seeing an accurate colour version of the world, but your brain is damping down red, leaving everything blueish.